It's great to play a real tube amp from time to tiime - it's like listening to records instead of compressed mp3's - I love booth!
If you only own modelers or the KPA - you will be shocked if you play a, great, real tube amp, next to you - and loud.
Will the KPA kill tube amps?
I don't think so - it's about the same as with the Variax guitar - after owning it - I liked some models so much - that I wanted to own the real thing too.
Most profiles sound like recorded tube amps - while the real amp pumps so much air.
Can we come close to the real thing?
Yes, close - if special profiles are used (created to sound close to the amp in the room vs. miked amp) - and if you use large speakers.
btw. I have sold a lot of amps - only 7 tube amps are left - no new ones bought since I own the KPA.
And modelers?
I have sold all - the KPA is the only digital amp left.