@Sand v. Hail-- what the hell? We are not obligated to make sand = hail at all. Do you see us doing anything about Sand's dominance of OU? There's no reason why the weather system has to be anything-- unless we deem something broken.
For a lot of reasons, I don't consider Walrein the main issue with hail teams. It's predictable, it gives the enemy plenty of opportunities to use counter measures, and it can't do jack if there's no poison up (fairly likely with roserade, nidoqueen, drapion and others running around), it's susceptible to encore, taunt, and phaze since practically none of them seem to carry their own roar, and hail teams must always be weary of letting something like Raikou or a Sub-Puncher use Walrein for set-up bait. There's more, but I'm just saying that while hail can be a very annoying force to deal with, Walrein is hardly the only problem.
For a lot of reasons, I don't consider Walrein the main issue with hail teams. It's predictable, it gives the enemy plenty of opportunities to use counter measures, and it can't do jack if there's no poison up (fairly likely with roserade, nidoqueen, drapion and others running around), it's susceptible to encore, taunt, and phaze since practically none of them seem to carry their own roar, and hail teams must always be weary of letting something like Raikou or a Sub-Puncher use Walrein for set-up bait. There's more, but I'm just saying that while hail can be a very annoying force to deal with, Walrein is hardly the only problem.