snowctrl :
10!!! Wow, we'll be lucky...
We're not in the same situation as we were years ago. We've got more CPU power than our software can currently use until we get DX12 and Mantle to actually use it. We'll also see a lot of optimizations as well especially with the cross-platform situation since consoles use x86 CPU's that are code compatible.
Most modern games use an average of about 50% of an i5-4570's resources or less (BF4 can use a lot more but I'd argue it's not that efficient). Make the coding more efficient and the same game would maybe use 33%. Assuming we can now access almost 100% of the resources we have a lot of room to work with even if games start using more CPU calculations.
It's unlikely we'll see new consoles until after 2020, and cross-platform games are likely to be very similar.
We'll also see some calculations sent server side for MMO's such as what's happened with Titanfall to calculate peer data instead of doing it on your own computer which is why MMO's tend to need a good CPU.
Again, there are also features like physics, AI etc which are likely to move over to the GPU.
HAVOK already did a PS4 demo of physics on the GPU.
Finally, at some point we may see graphics cards include a dedicated CPU to assist or even replace most of what the main CPU does.