You do realize there is more to a computer than clock speed, right? First of all, improved performance is not the sole reason of waiting for the second gen. That's an added bonus. However, there are more important issues at hand.
* Quality control, with regards to keyboard quality and battery life. Read around the forums, people have had issues with sticking keys, keys no longer working et.c. Also, people are reporting that the battery health is not up to Apples standard, less than a year after its release, some are reporting only 80-90 % health.
The keyboard design is completely new, the same goes for the terraced battery cells. Problems are inevitable in a first gen device, this will most likely be corrected in the next revision.
I'm not saying everyone will suffer from these problems, but I am not going to take the risk.
* Secondly, Skylake is assumed to bring much better graphics to the table. This is what matters to me, not an added 0.1 GHz... We're talking a 40 % improvement, maybe more. This will help with the UI lag some users are reporting. Moreover, the Skylake M is also an improvement on the first gen Core M, so should be more reliable.
* Improved battery runtime thanks to Skylake. Most users are reporting around 6-7 hours of usage from their rMBs. This is not enough for me personally, but Skylake could bring it up to 8 hours, which means it would work a full day on battery. This would be great for my needs.
Those are three (for me) very important reasons to wait for the new model. Then, there is also the possibility of:
* 720p FaceTime Camera
* An extra USB-c port, you never know..
* TB3 over USB-C (not that it really matters to me)
Not going to speculate any further.
Even with only the Skylake-upgrade and improvements in quality control, that would seem a much better purchase.
Now imagine a reduced price on top of all this. Maybe at $1199 or $1099. Or you could wait a month or two and find unopened ones on Craigslist/eBay for $1000. Or wait for Best Buy to sell them for $999.
But hey, this is just my opinion of course. Do whatever makes you happy!