after gelato fiasco, i wouldnt hold my breath that nvidia will sell a software renderer for very long! 
it isn’t their core business, and releasing the people who would fight for it seems to me like a sure fire start to dissipating the interest.
it’s like apple and shake, final cut etc. when 98% of your revenue comes from something else [nvidia: selling chips/cards] the other 2% tends to get neglected.
cb