I've been imagining a "Playstation 4 Seasons" (or some other clever name....Playstation Historian.....Ultimate Playstation) that would play the entire library of physical (and digital, where applicable) games from all 4 Playstation consoles. Now that would be special.
I'm sure it's nothing even remotely anything like that, but I'd be willing to pay $1000 for an all-in-one Playstation. It would be great to have only one PS to replace my PS2/3/4 (PS1 by proxy) with.
In a more practical sense, maybe a PS4 Pro VR where the PSVR's "little box of chips" is incorporated into the console for easier PSVR hookup.