Moire and false color only affects a very small number of still shots and video footings
I don't know if you've done much video with previous models, but IMHO, you may be underestimating how often moire would rear its ugly head.
It certainly would be nice to have the option to turn it off. But if it's an all-or-nothing decision... Frankly, in terms of video, you couldn't pay me enough to remove the 5d3 AA filter. I've never once (in my days of shooting video with the 5d2/7D/T2i) had a paying client ask why the image wasn't any sharper - however, I HAVE had to answer "Why is the collar of his shirt doing that weird stripey pattern thing? That's really distracting".
Granted - I'm not a high-end cinema DP, and don't pretend to be one on forums unlike many, and I'm not even strictly video-only - I'm closer to 50/50 stills and video. The sort of shooting I do is usually for corporate online or 1080 flat panel display use (i.e. kiosks and tradeshow displays) and wedding video. It's not sexy, but it pays the bills and my stuff is rarely intended for the big screen (hey, we can't all be Steven Spielberg). I'll be working on an indie short in a couple weeks shot with 2 5D3's which will hopefully get some big screen showings, but for the stuff that actually pays the bills, the 5D3 video quality so far is still proving to blow them away (at least on the ONE paying project I've shot with it so far)... and never having to even worry about moire is HUGE.
That's not even mentioning the still shoots I've done with it, with fantastic image quality with plenty of crisp detail and keeper rates that are so far beyond that which I ever got with the 5D2 from the massive AF improvements... I'm a very happy camper with the 3 - but that's just me!