If Sony doesn't put out the PS4 this year when MS releases its new 16 core (with 2 threads per core) console then they didn't learn the lesson from the PS3. Had they released the PS3 in 2005 they wouldn't FINALLY be passing the 360's sales at a time when new games will start winding down. They should abandon. The Vita.
Yes they would have dominated last gen if they had got the console out earlier, no doubt.