We'll just have to see won't weThere is no guarantee that the MacBook will support TB3. The chips are being released alongside Skylake but are not mandatory.
Also, I don't think you can measure sales based on wait times. Apple used a new supplier for the MacBook, which was the same supplier they used for the Watch. The yield issues for the Watch were well documented. My guess is that the MacBook was supply constrained. Sales might be higher right now because the MacBook is in stock and it's back to school season.
Wasn't aware that Quanta Computer was a new manufacturing partner for Apple. IIRC they make/made all the MBA's, lots of the iMacs, and MBP's too, as well as the rMB and Apple Watch...
Don't disagree with the idea that the rMB may have been limited more by supply than demand in the beginning though.