I was just thinking that if Aldaron's Proposal gets accepted and Reuniclus also stays unbanned for the next round, then RainStall is going to get a lot more popular. It would not only check other weathers, but it's a generally good playstyle, since it's basically HailStall on steroids minus the passive damage, but plus high-powered STAB moves (with more than 8 PP) and less glaring weaknesses to certain types.
An interesting thing about RainStall is that because of the Rain, it hits a lot harder than traditional stall. It also commonly carries Parasect, who's an incredible check to Reuniclus, and a great pokemon in general for RainStall. Politoed itself is a pretty good check since it has Encore, Hypnosis, and Perish Song. Not only this, but provided Rain stays up, a lot of the abusers can last longer than traditional stallers with stuff like Rain Dish and Hydration getting more distribution. It can still fit a lot of diverse pokemon on the team, including the the Ferrothorn + Jellicent core, since Ferrothorn loves having his Fire weakness lessened, while Jellicent likes giving his STAB Boiling Waters a little more sting, while still being a good spinblocker for the team.
Just a thought, but because of this, maybe stall still has a chance against Reuniclus if RainStall starts to get more popular. I still don't think traditional stall has died out even if Reuniclus is OU, but RainStall seems like it would fare much better against Reuniclus. I know it's not popular now, but maybe it'll catch on as a nice alternative to traditional stall, especially if Aldaron's Proposal gets accepted.