The removal of Blissey will also drastically decrease usage of stall teams. Due to this, offensive teams may reign the metagame and everything will probably be revenge kill this, bait this, revenge kill that, etc...
That's my theory. But, I think this thread is a great idea. Why? Because what other Pokemon effects the metagame more than Blissey? If we remove Blissey from the metagame, then the whole metagame would obviously change. While it is a much better pick over suspect Salamence (in my opinion).
Also, others are stating how special sweepers will dominate the metagame in the abscence of Blissey. This is not entirely true at all. Are you saying that if your team does not consist of Blissey, your team is weak to special sweepers?
While observing the usage statistics we observe that a lot of special sweepers lack usage. This is probably most notably because of Blissey. Thus, in the abscence of Blissey, these special attackers are more viable to use (which is a good thing).