One of the main reasons that I use APS-C is that they are smaller and lighter than Full Frame cameras. Why would I want a gripped body that is larger and heavier than a 5D3 Makes no sense to me, therefore a Deal Breaker..I used to think the same.
Lately, I'm reconsidering my preferences due to the many valid reasons voiced by other CR members in the above linked (and other) threads; not that those of the ungripped body camp aren't valid reasons, either. At present I'm 50/50, both options display advantages and disadvantages. So it seems I won't be disappointed in any case.
At my own risk, let me add - and let the bashing begin! - that I'd be happy to see fewer and better MP than the 7D along with FPS equal or higher than the 1Dx. Overoptimism on my side? Maybe, but I don't think so. I'm awaiting for this baby weanling unicorn to finally deploy its wings, come on!!!