The support from indie devs is pretty nice too, since people have proven they'll pay for quality indie games with the humble indie bundle, and sony's co-op with indie devs on games like journey (http://thatgamecompany.com/games/journey/) is a big vote of confidence.
Ultimately, what draws people to a platform are the games, so it's good to have a bunch of proven games already, and more coming. Now, all it needs is a few killer exclusives.