Re: can we admit segwit SF is never going to get 95% approval?
All Core vs except Luke JR I think which actually wants to make the blocksize smaller, want to eventually make the blocksize higher.
That is correct. However, BU & their fanatics are not concerned with whether their "teachings" are related to reality/the truth or not. 
I think the biggest problems anti-Core guys have is that they don't trust them. Core hasn't said a specific date where this blocksize increase would happen, I think they will not stop complaining until Core gives a clear date to raise the blocksize after the segwit activation, but I think if Core did that, they would still complain and don't trust them. They just hate them now no matter what they do.
Okay, BillyBob. Can you give one good technical reason why separating out witness data is a good idea and why?
People like me don't necessarily not like Core, we just realize they are working for the banks at this point. No, they don't literally work at BoA, silly buns, they are getting paid by big corporations like AXA that represent the same interests though.
As far as I can tell, the only rational reason for separating out witness data would be if you wanted to restrict access to it later in a takeover scheme.