As Click discusses in his Google tech talk (http://www.youtube.com/watch?v=5uljtqyBLxI) Intel could implement a hardware read-barrier and radically change the GC performance picture for commodity systems.
There are many things CPU designers could do to improve high-level language performance. (See: http://www.loper-os.org/?p=46) However, they will do none of them. The "we shall build C/C++ machines forever" dogma continues to rule with an iron fist.
There "is no market" for high-level-language-friendly silicon, because there is no software for it, because there is no market...