The systems are extremely outdated, we probably won't see the actual release of the next consoles until next year but with how old these consoles are and games have already been hitting the limit for them developers are surely wanting to be able to do more as well. Yes, games are still being released but it doesn't really matter, the PS2 was still having games released for it years after the PS3 had already been out. The point of making a new system will be for the people who will want because Sony knows they'll buy it and for the ones who think it's too early to get a new console or too costly, well that's why they'll still be marketing the PS3 for a few extra years anyway.
I think it's well at the point where new consoles need to be announced, the limits of the current ones are bothersome to me.