Well, that line of thought depends on if you consider multi-GPU gaming desirable. If not, the PCIe lanes are easily sufficient, and I believe for future (as in, say, 2017) CPU-heavy games you'll be set up much better with e.g. a 4.2 GHz 5820K than a 5 GHz 4790K. And for current and past ones, the serial performance of either one suffices.
So, if you can afford it and want to only do major (that is more than a GPU replacement) changes to your build as rarely as possible it seems reasonable enough to me. At least that's my thinking.
Of course, we still need to see how they OC. I think it will be a matter of cooling, much more so than for the mainstream chips.