Gliscor is absolutely not a problem right now. The tier is infested with Spikers and Gliscor is merely the best one, but far from the only good one. Spikers like Ting-Lu has phasing, Meow has pivot, H-Smaurott has priority, Skarmory has excellent profile. Many Spikers in OU have tools to distinguish themselves well enough to remain viable. Banning Gliscor won't fix hazards.
I've played Ubers UU, and also made tons of analysis over the last 6 weeks of a tournament. Ubers UU during december lacked both Gliscor, Landorus-Therian, Ting-Lu, Clodsire, Glimmora and Ribombee are all "Ubers by usage", while Skarmory was not allowed up until January due to DLC, and the tier just got Giratina and Corviknigh,t both with defog and good defensive profile, while the best hazard setters are special attacking bulky steel types in Dialga and Magearna, and therefore don't work well alongside Gholdengo.
You think a tier like that would have lower need to use boots and that Gholdengo wouldn't be that good... you sweet summer child.
Gholdengo Spikes HO still became the most popular team composition, using otherwise mediocre pokémon in the tier, most notably Garchomp being top 10 by week 5 because it was basically the Gliscor at home, while Landorus-Incarnate was also a popular stealth rock user because Gholdengo owns the best spinner the tier had in Cyclizar, as well as the two defoggers. CUTIEFLY was a genuine pick for Web teams, even though most preferred Masquerain or leavanny. The problem is clearly Gholdengo enabling those teams via being so good at spinblocking, and while Ubers UU has enough counterplay to the cheese bar due to underwhelming stats for the tier, Gholdengo's stats are average in OU. Similar story in NatdexOU where Gholdengo was seen as too much and since then the hazard counterplay improved significantly.
I KNOW banning Gholdengo won't fix everything about OU's HO being too good, but It'll make removing hazards easier for some structures because Dragapult lacks recover. It's a clear, palpable improvement both in theory and in practice seeing how other tiers handled this issue of good as gold in a ghost type making hazards too easy to stack.
Besides that, Gholdengo is just very uninteractive as a pokémon due to blocking all status moves; no paralysis, no sleep, no burns, no phasing with Roar/whirlwind, no taunt to stop setup or recover, and while Magic bounce does the same, Gholdengo also blocks defog and rapid spin. Is just a very obnoxious one-sided floodgate attached to an otherwise fine pokémon.