I do rather like that high end CPUs easily last 5+ years currently. I've got a 2600k which is almost going on four years and its likely the last thing in my rig that I'd replace within the next few years.
Considering the new consoles have laptop-grade CPUs inside them, I wouldn't expect games to get much more CPU-intensive any time soon. Maybe a few PC exclusives like Star Citizen will bring it to its knees.
Actually they use AMD Jaguar Temash low power tablet cpu's. They are a step below laptop cpu's.
We are going to see some wild advancements in AI this gen hahahahaha
I really hope we get some good PC games that show off the true power of say a 780/4770K.