I doubt it will affect me on Xbox, Blizzard has shown they don't give a fuck about console lol. At least, it'll be awhile before they do anything.
I don't really agree with it though, people don't understand this game well enough to accurately address what is wrong with a team / report people for not doing what is "best". Also most one-tricks suck ass on other heroes especially in GM. Do you really want you Symm main on McCree for Pharah? Like yeah in theory McCree is better vs Pharah but let's be real I'd rather take the Shield Gen so it takes 3 rockets > 2 to kill. Cause the Symm main ain't hitting shit with McCree LUL.
Most of the arguments for it are really bad too. Examples:
"Symm main automatically put my team at a disadvantage" - Most Symm mains have higher winrates than people at their rank playing different / "meta" heroes. If anything, a Symm main on your team is more often than not an advantage (at least, based on pure winrate.)
"Symm mains are boosted by performance based SR" - Not only is there no real evidence of this, but if you look at most Symm mains in GM / Top 500 it's often the opposite. Most have a 60% winrate or higher (Steevo, me), and those who have under a 60% winrate usually have a fuckton of hours (NUT!), causing overall SR gains over time. I literally have never met a Symm main who has an under 55% winrate and isn't dropping SR, and I doubt you have either.
"Symm mains / one-tricks don't communicate!" - Well a ton of people don't communicate, ban them all too lol. Also, a lot of people who would otherwise communicate are chat banned (like me! >:[) because Blizzard is stupid and thinks that's what people want to happen to one tricks when they report them.
"People who play Symm prioritize their 'fun' over everyone else / over winning" - Most Symm mains, such as myself, are playing Symm because we see it as our best chance of winning. I've told the story in this thread previously about how I've tried switching to main Mercy in s4 and dropped to 3750, and switched back to one-trick Symm to get back to 4150. I play Symm because I want to win and gain SR. Maybe you think I "belong" at a lower rank because I play one hero, but I'd rather be at 4380 playing Symm lol.
"One tricks should learn another hero, it's so easy xDDDD" - Well I've already given the example above how trying to learn other heroes has resulted in me losing more than winning (it's not just Mercy too, I had 3 hours on Lucio / D.va season 5 or 6 (idr) and they both had sub-30% winrates.) But more importantly it's fucking hard to learn a character at GM-level. Like for example, getting a character from gold-level to platinum-level generally involves making very visible changes (using Symm as an example, placing turrets in better spots, focusing more on ult charge, using shield better, not running in a straight line with beam). But to get a character from master-level to GM-level it's waaaay harder, the changes are much more minute and really hard to make. Anyone who says its easy either isn't very good (sorry!) or is better than me lol.
"Overwatch is based around hero switching, therefore if they've played basically nothing else they must not be playing to win" - If this was true, one-tricks wouldn't be getting Top 500. If we are to assume that "switching is a core part of competitive Overwatch", then we must also assume that there are many situations where heroes aren't effective and need to be swapped. But for the majority of games this isn't true, because I and many one-tricks are winning more often then we're losing, and gaining rank because of it. If we are winning and being successful with only one hero, then switching is obviously not as effective as it is made out to be, both by Blizzard and by players.
"Okay, so hero switching isn't always important, but it is like 20% of the time and that's when Symm mains throw" - Even if you are assuming that the 20% of a Symm main's games are 100% lost because the Symm is being hard-countered, it still doesn't change the fact that Symmetra is more beneficial to play in most situations than not, which make engaging with hero switching unnecessary for overall SR gain. And in practice, virtually no games are lost 100% due to the Symm pick, there are some (and I try to switch if I feel I'm in that situation, it's why I have a few minutes on other heroes), but most of the time there are really basic factors which are leading to a loss (not grouping up, bad ult economy, etc). Plus, most people have no fucking clue when a Symm is being countered or not, or make idiotic claims based entirely on team comp. So many time I've heard "switching off Symm, we can't win vs PharahMercy!!!1!" just to win the game lol. Hard hero counters just aren't a thing, no matter what people tell you - if they were, certain heroes just wouldn't climb.
"Symm mains aren't bad / throwing but they ruin the fun for all other 11 people" - Well A. This is assuming that everyone else hates Symm mains in comp, and that isn't true. Most people in fact don't give me shit. Just because your /r/CompetitiveOverwatch post got 200 upvotes doesn't mean the other 2,000,000+ comp players hate Symm. Secondly, and more importantly, I have been told that I shouldn't be allowed to play Symm in comp because I am prioritizing my fun over the competitive nature of the competitive gamemode - why, therefore, do I need to switch on my best competitive pick to make the game more fun for other people?
If you want to make one-tricking worse, then change the SR system to hurt one-tricking and/or help flexing. Or make hero switching actually necessary to climb. Cause right now, there's no reason for me to engage / spend time with a unnecessary piece of competitive play (switching).