I think that it's very unfortunate for piece of hardware that cost aprox. 3500$ for 5DMarkIII, and 6800$ for Canon flagship camera 1Dx, that those new models can't produce 1080/60p, while Panasonic HDC-TM900 as mentioned before here in this post by user "stevenrrmanir" can provide that feature for $800
Can your TM900 take stills at 5000x3000? Can it take them at 6fps or 10fps? Can it produce a depth of field even equivalent to f/3.5? Can it handle shooting in the near dark and produce a relatively clean image? Can it's footage be used immediately out of the camera? Does it allow me to customize color profiles that make it easier to grade in post?
I own one, I know the answer is no to all of those questions. It's not an apples to apples comparison. More like apples to concrete. Canon already has some minor issues with camera's overheating on longer shots, 1080/60 would probably magnify that. Not to mention it could cause recording to drop if the buffer rate isn't up to par. So, if they can't implement in cleanly, they wouldn't do it at all. Check the reviews for Sony's DSLR's (well, DSLT's), they all have big issues with overheating when recording video due to the 1080/60. The A55 was notorious for that. 1080/60 doesn't do you any good if you can't even get the shot
It's why the new Canon cine cameras have completely different internals. To be able to record and process 1080/60 or 4k, you can't have so many pieces so close all overheating. A firmware upgrade probably isn't enough without it causing issues.
Canon's flagship camcorder (the $1350 VIXIA HF G10) can't produce 1080P60 either.
Nor does the XA-10, or any of the XF cameras as far as I know. And since I use those frequently for work, I can tell you that I don't miss the 60fps ever. It's really only something you need in action shooting, and then, you want the tiniest camera you can get so its portable. That's where the TM700/900 win out. But, I'm able to carry my 60D with a lens or two AND my TM700 with me wherever I go. My 60D will never match the convenience of the TM, my TM will never match the look of the 60D. I ultimately need both