Not even trying to meme:
They could buff pyro mechanics to a point were almost every last hold will use a pyro in 6s because it'd be stupid not to.
If the core mechanics of pyro become absolute aids not even the global whitelist can save us unless stock pyro gets banned which will never happen.
That's the worst case scenario.
I'm hopeful though. They listen to sigsegv and he made a mod for cone shaped airblasts with actual physics. They also mentioned http://frompyrowithlove.com/ in their blog post. So all in all I'm actually quite okay with what I've seen so far. I'm expecting more fixes than buffs.
I'm looking less forward to the heavy update though. Heavy currently is so boring I'm expecting them to add an entirely new mechanic to make it fun in pubs which can go very poorly