It looks like YC is actually shifting to investing in products that have a real way of generating revenue this time. I'm not sure if this is a trend in the whole VC community though.
There are great VCs that spot trends before they are big trends and then there are VCs that miss the boat because they invest when things are already frothy. So buzzwords like "social" and "mobile" happen and then "enterprise" becomes a hot story in the tech press after people get sick of thinking social will be the end all be all of VC investing. The things is VCs are going for 100X exits, so something that generates revenue that doesn't have the potential to be big is just as bad for a VC as a social product that probably won't make revenue anytime soon.
