The removal of sight stone will only serve to hinder the team.

It doesn't matter what lane you play warding is a huge part of league, by putting the active to support items when finished it means nobody else, but bot lane can reliably have a sight stone in game. If your support decides she's to good and grabs a then who's going to grab the ? It's generally the top laner. Who instead of having someone else to look out for him has to do all of it by himself and counter jungle to help allow his jungler to know when and where the enemy jungler is. Now Teemo is just knowledgable about warding, but it goes the same for most tanky top laners/ bruisers, so long as they are ahead enough to see it worth value. With the removal the top laners won't have that option. They'll have to substitute to rng kleptomancy if it's what the team needs, but that's just not good enough. If your going to remove sight stone and enforce supports to stack it tell a certain time frame within the game then bring back Because the worst we can do is make support players feel like without them we're nothing when we should be helping them making their role less valued, but just be more coopartive.

TLDR: Without sight stone active it's like jungling without smite. Your team will have a disadvantage throughout the game because of the reliance on the single player. Except there's no way to know if you should dodge until after they buy items and you can't fix it because only bot lane is capable of having sight stone active.