I think is down to the hardware providers if they want to keep supporting/ maintaining or updating their HW. Like security update etc, but they might have more to so with Sony side. Anyway trophies /leader board support are coming. Guess it only make sense that they do.
http://www.neogaf.com/forum/showthread.php?t=487059
http://www.neogaf.com/forum/showthread.php?t=487059