The only reason your comment is sort of true (not sure it actually is) is the inclusion of "as an asset class". The easily identifiable top tier firms are killing it.
[1] http://www.daniellemorrill.com/2013/04/zombie-vcs/
and... more recently "New data suggests the decline has been more severe than previously thought, finding fewer than 100 active U.S. VC firms in the technology sector.":
[2] http://www.daniellemorrill.com/2013/04/zombie-vc-shakeout-co...
2) Whether the VC market is crawling along or zooming is dependent on both the economy and the Fed's monetary policy. When money is cheap and easy to come by, it chases higher risk investments. If you can't earn 1% on your dollars, you're more likely to push that capital into riskier investments seeking yield.