I feel the debate is what will kill jumping most.
I run a fairly laid back Jump Community, and maybe 5-10% of our traffic even understands what a basic TAS would be capable of, Most are happy to jump. Yes the medium skill of the top tier guys will probably drop a bit. But I don't see it affecting the greater population much. If anything it might peek interest in trick shots. Hopefully without removing their interest in jumping as a whole.
From the better jumpers on my server, most have just said they'd like to practice trick shots more to find out how likely they'd be able to pull it off in the first place.
But who knows, TF2 & Jumping will be around a long time. Anything is possible.