I believe it will last as long as the last generation.Games are taking much longer to make, and as such, a normal console cycle(4-5 years), is not sustenable anymore.Not to meantion pS4 enormous success, which can hold this gen a little longer.Next gen will only come, at earliest, at end 2020(nintendo being a possible exception), in my opinion.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1







