After the horror of 1989, big proddie bikes were ruled out, but -- it's cool how they evolved so rapidly and found their way back. I very much doubt you'll ever see anything smaller than 600 racing, unless they 'invent' a pukka racer capable of lapping as fast as the slower 600's, that is affordable to all. There just isn't enough time for a field of - maybe 40 smaller bikes that would probably see the slower riders almost getting lapped by the 'handful' of fast guys - in a 4 lapper. That being said -- for safety's sake, I'm all for smaller, more manageable bikes than the 200hp monsters of today.