I don't see how this is relevant to the release of the 1080 or 1070. If people can run quad SLI Titan X cards without bottlenecking, why bring this up now? If there is a bottleneck, it is because the game is CPU bound or not optimized properly. The CPUs of today are able to feed the GPUs fine provided that the games are simpler and not forcing heavy calculations like advanced physics and collisions on the CPU itself. If you are asking too much of the CPU, then it will have less resources to dedicate towards feeding the GPU. So, the CPU can certainly be a bottleneck, but it is not necessarily the GPU taking up the resources. That being said.... we could definitely use faster CPUs to eliminate bottlenecks (regardless of how they are being caused) and to keep advancing games.
present amd cpu's and intel budget cpu's definitely. but not the current high end intel offers and the new cpu's to released.
For intel i5 and better... It depends on the game and how many fps you wish to achieve. 60Hz and I seriously doubt it, except for minimum fps which very often benefits from a stronger CPU but the gains aren't big.
144Hz and you will want your CPU to be as fast as possible as well. And probably have RAM running at 2400MHz+
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