LINKS.
I can't provide direct proof of whether the 4700MQ would ever be a bottleneck. What I CAN do is show you that if there is a bottleneck it's not a huge deal. I guarantee there's a bottleneck in some games, but again if the cost to upgrade to a faster CPU FREQUENCY (i.e. $500 for 300MHz) is too high don't do it.
So, this is the best I can manage...
i7-4700MQ relative performance:
http://community.futuremark.com/hardware/cpu/Intel+Core+i7-4700MQ/review
*Basically almost as good as an i5-2500K which I assume is at stock speed.
2x780M should be very similar to a GTX690. I found benchmarks of the GTX690 paired with an i5-2500K at 3.3GHz:
http://www.bit-tech.net/hardware/2012/06/13/nvidia-geforce-gtx-690-4gb-review/4
This graph is typical of the other games here.
ANALYSIS:
If the i5-2500K was severely bottlenecking the GTX690, then the 690 wouldn't be scoring higher than the other cards. It is mostly. You can however see in SKYRIM at 1920x1080 there's a CPU bottleneck happening, whereas in BF3 single player a the same resolution, the GTX690 is much faster than the 2nd card indicating no CPU bottleneck.
*The bottleneck that will occur in SKYRIM is way above 60FPS. Your screen is 60Hz and it's best to run with VSYNC to not only prevent screen tearing, but SIGNIFICANTLY reduce your laptop noise (it will likely WHINE when maxed with VSYNC OFF). So a better CPU (or better GPU for that matter) will make no difference.
CONCLUSION:
My advice is thus to get the i7-4700MQ or similar and not pay a premium for a better processor that would provide only a small benefit to some game.
Again, this is a great gaming rig and maintaining 60FPS isn't difficult for most games. Even the most demanding can hit 60FPS with a few tweaks. Once you are capped at 60FPS a better CPU would make no difference. And again, always use VSYNC to avoid the extreme heat and thus noise running GPU's at 100% will do.
So I suggest you take the extra money you considered spending on a better CPU and put it towards something that would REALLY make a big difference like a great 27" 2560x1440 desktop monitor ( Dell U2713HM or Samsung), or speakers, gaming mouse whatever.
I hope this has helped.