People keep talking speed tiers this and memorizing stat that. Without seeing the actual, solid changes, in writing, a number of the people reading through this are going to feel like they are being pushed back and forth by boogie men within the community. This sounds less like a Smogon policy discussion and more like the American Politicians duking it out.
Just as an example, at level 100, 252/252+ Hippowdon can always survive 2 Close Combats from Choice Band Terrakion at full health. At level 50, Terrakion can 2HKO ~6% of the time. It's not much, but that's the sort of power creep you'll start seeing all across the board. Seeing as how a common complaint about new games is the power creep, this is pretty significant. As for speed tiers, one example would be Scarf base 60s. They ordinarily failed to outspeed Starmie at +1, which gave Tyranitar (base 61 Spe) a cool advantage as a Scarf user since it could. At level 50, Scarf base 60s now outspeed Starmie. Likewise, Scarf base 70s can now outspeed base 130s, which they were previously unable to do.
The OP is also misleading in saying lv.50 is the only Wi-fi option, when several people have pointed out that lv.100 is wholly possible in non-random matches.
Also, this. People are acting like if we don't drop the mark to level 50, we're no longer staying true to the game. It certainly is possible to battle other people at whatever level you want. Yes, it takes more work. So does EV training. So does breeding for the right nature, ability, IVs, and moves. The point of Pokemon simulators are to remove the extra work so that you can make an ideal team and jump right into battles. I don't see why we have to adjust level for Wi-Fi players when they could just as easily get a level 100 team with enough effort.