Are future improvements in Amp/PreAmps slowing to a crawl?

To answer the thread question...
Nelson Pass is right (about Nelson Pass)

Pass:

Oh, I want perfection, all right, but I'm secure in the knowledge that I won't achieve it.

Some designers give up looking for perfection. Its extremely difficult even with state of the art devices. This is why there is a mindset that you just have to take the pros and cons of various components and make the best combination that gives you the "sound" you're looking for.That seems to be the norm.

And with that kind of attitude I’m sure he never will find perfection.

Life is is what you make it to be. - Fresh out of Borstal

An ordinary man has no means of deliverance.  Old audiophile axiom

Anyone out there banging on that "perfect amp" drum mind explaining exactly what the perfect amp would sound like or perform like? A straight wire with gain? We already know that isn't ideal. So what then? 

Define crawl. It means different things to different people. Seriously, bro. 

No takers? Nobody can tell me what the perfect amp is like? Am I to take that as conceding that Nelson is right?