Something to remember is that we are not tiering for any hypothetical DLC2. We are tiering for the current metagame. We shouldn't be looking ahead to DLC2 when talking about the current meta, especially since I believe Finchinator has said there will be a Home-esque unban wave.
I mostly play small fan tiers now, but I was cursed to care about Smogon, so I'm going to leave my thoughts from what I have seen and played at 3AM even though I have class in 6 hours. I think the biggest issue with the current metagame, as outlined above by SDK, is the current state of hazard play. In the boots era, the more hazards in a meta, the more polarizing teams become. This isn't a universal rule, but it's a decently common trend. I think hazards are healthy in a vacuum, but in metas where removal is difficult to impossible, they can become overcentralizing. Hazards being centralizing leads to boots being centralizing on defensive teams, which leads to knock off being centralizing, which leads to Roaring Moon going from mid to Ubers but I disgress
That said, I do think Gholdengo is the biggest issue here and should be looked at. Spinblocking is nothing new to competitive Pokemon, neither is punishing Defog. Gholdengo has a unique set of traits that allow it to control the hazard metagame to, I believe, an unhealthy extent. One comment I've seen is that "if Ghold gets banned, we'll just see other mons spinblock", which is technically true, but misses half the point of why Ghold is so good at what it does. Spinblocking (or, for another example, using Defiant to punish Defog) is inherently risky because, if your opponent predicts it, you often cripple or even flat-out lose the spinblocker. The list of Pokemon that can punish Gholdengo is not large. "But so many of the top tiers beat!!" Sure. My argument is that they are top tiers because of Gholdengo--mons that beat Gholdengo in addition to doing other stuff pushes them over mons of the same role that don't beat Ghold. Look at how Tusk is the only Rapid Spinner worth a damn in OU. There's some solid spinners in UU that have some appealing traits... but they get shut down by Ghold so that's a complete no-go. Creative hazard removal is impossible as long as Gholdengo is in the tier. I'm not saying "creative hazard removal" because I think Tsareena is secretly OU-viable in a Ghold-less metagame, but I do think we would see more than Tusk. Cyclizar and Quaq are two Pokemon with very interesting toolkits that could fit into OU teams, but are unable to do their jobs with Ghold around. They currently lie D and UR respectively. There are a few Defoggers ranked in the lower viability ranks that appreciate Ghold being gone as well. It's not as drastic, but there are a couple Defoggers in UU that would be more playable without Ghold in the tier. Cinderace is a top Pokemon right now due to Court Change. People are running Maushold to bypass Ghold, and it's doing good enough as of right now to be ranked B-. There's only 3 removers ranked B or higher (technically there's 5 but Glimmora and Torkoal aren't ranked primarily for their removal, though I admit they can compress it), in part because the rest can't beat a single Pokemon... should we not look at that Pokemon?
Removing Ghold re-opens hazard play to more creativity while also decentralizes the tier. People can run removers that aren't Tusk, Cinderace, or the occasional Defogger, usually Corv. Removing Ghold is one less reason to run Kingambit (though Pult would admittedly still be a problem). I recognize that Ghold has defensive merits and removing it would push some Pokemon over the edge. With that said, I think that something needs to give in this currently broken-checks-broken metagame, and, in my opinion, banning Gholdengo is the first domino we need to topple to see what truly are the broken things. Are the current offensive juggernauts as broken as they are if they have to deal 24% damage on the switch? Is Gliscor as problematic as it is if things don't have to worry about being chipped to death (as much)? Questions worth pondering. I'm not sure how this post will go over but I hope it at least gets some people thinking. also if we ban ghold we can free Roaring Mid my boy did nothing wrong
tldr: "Remember! Reality's an illusion, the universe is a hologram, ban Ghold, bye!" - Bill Cipher