at this point the question should be: who the hell still isn't supporting BU?
The only people who matter, the Core devs, aren't supporting BU.
If the Core devs don't support BU, who is going to fix it when they break something (again)?
And who will import all the nifty new features from Core to BU?
It's like buying a new car and installing a bunch of
homespun, amateur "custom" electrical work to support your shitty try-hard stereo/subs/lights.
When you eventually break the basic functionality for the sake of your gimmicks, the dealer is going to laugh in your face when you try to get it fixed under warranty.
If you love BTC core that much , maybe you should get a room and ask G.Maxwell to whisper software code into your ear.

Fact is BTC Core are attempting an overthrown of BTC by devious maneuvers ,
People like that:
You Fire!
You don't agree to their ransom demands.
Well you might, you're kind of a punk.

FYI:
China owns the majority of the mining pools, they might as well setup a new dev team to replace core.
I doubt many would miss BTC core's shenanigans at all.