I doubt its impacting them that much. I mean its only 15 grand. Maybe the YC graduates will have a tough time getting funding...but the actual program will probably operate as usual
Smart angels and VC's will certainly still be investing. I would guess they'd be looking more favorably at companies that have a clear business model, but they're always going to take chances on interesting ideas/technology/people.
the money has to go somewhere, and alot of people are telling you to park it somewhere for 5 years. what better place is there to park some equity than in a new startup?