August the 2nd is too.

Right. But we don't need to be sacred about the date. If it wouldn't be necessary "most crucial decision" wouldn't been taken, would it? I think it will bring only positive changes to all crypto-currency system.
august 3rd too. I am not afraid and I think it's also a positive change but what about the chain split issue saying bitcoin will be two? segwit is a troubleshooter for users who find the bitcoin transaction feels long and expensive.