The numbers (in startups, at least) are much, much smaller than 2008. Total VC funding was about $48B in 2014 [1]. By contrast, the subprime mortgage in 2007 was $1.3T [2]. The current student debt loan burden is about $1.2T [3].
I predict that the coming tech crunch will be a sideshow in much bigger chaos caused by the effects of rising interest rates on newly-minted college grads. We live in a bubble in Silicon Valley; across most of the country, youth employment never really ticked upwards. If interest rates go up, I think we'd start to see widespread non-payment of student loans and possible political unrest. That's much scarier than a few startups going belly-up.