We have two scenarios for it. A ps1 and ps2 scenario where Sony reposition ps4 as an entry level Playstation experience with aggressive price cuts both on hardware and software mainly to appeal to emergent markets where most people don't have income to afford a new Gen console and games.
Or the ps3 scenario, where Sony pretty much abandoned it once they saw ps4 juggernaut success.
For the way things are going for ps4, I believe it will be the first case. We are getting very big releases this year just months away from ps5 release. And I think ps4 has room to agressive price cut, it can go as low as 149 usd for base model considering it uses low end hardware by today standards.