This actually makes quite a bit of sense. At the scale that YC is at now, there are already a few companies worth 10x Quora (Dropbox, Twitch, AirBnB). I'm sure

This actually makes quite a bit of sense. At the scale that YC is at now, there are already a few companies worth 10x Quora (Dropbox, Twitch, AirBnB). I'm sure even at Dropbox et al's scale both Dropbox and YC get a lot out of the ongoing relationship. Therefore, in these types of mutually beneficial scenarios why would YC or companies for that matter artificially limit themselves to only getting into such a relationship during some arbitrary timeline? When you think about it, putting such an arbitrary limit doesn't make sense, and voila you've broken a mental barrier and can now change the rules of the game. As a founder of a YC company I would absolutely love it if YC becomes this broad "old boys/girls" network of awesome tech companies. Who actually cares about what stage the company was at when they joined YC. The more great companies part of the club, the better!