Sales will decide whether this is overkill or not.
God of War Collection released ~ 2-and-a-half years after God of War 2, but people didn't seem to mind then. In fact, 2.5m people didn't mind very much at all.
Given how many supposed "conversion" stories I read on various places around the internet, too, I don't think this is a particularly bad idea at all. Will sell to people who traded in their PS3's but would like to keep the game (or want to play online). Will sell to ex-360/Wii owners or any PC-only gamers who decided they wanted a PS4. Will sell to anyone who was interested but held off in case of a definitive version (i.e. me.)
Looks fine to me.