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

The answer to the question of this thread is, Yes!,  As a mater of fact,  the technology is going backward's with the invention of class D.                  However,  company's like Gryphon is pushing the technology of class A.                                           The fact you see class D is a money making scheme,  this is a very cheap implementation,  the profits are astounding to say the least,  Class A is extremely more expensive, the profit margin is far less unless you charge the amount of burying a cheap fix up and resale house!, the good ole day's of class A costing below $30,000 is over, I remember Krell, pass labs, Boulder,  Mark Levinson, Jeff Roland, etc...                              High end audio in general these day's is over priced.