Ok first off, no one promised you a 70D today, so your negative feelings have nothing to do with Canon and everything to do with your expectations.
if you want to shoot video on a large-sensor camera, you have to learn how to focus manually. The motion picture industry has been doing it this way since it's inception and continues to do so. We are very far away from having AF for video on a DSLR, with as many lenses as there are it would be extremely difficult to make them all work perfectly. I mean do you really want to trust a camera to pull focus for you at the right time and to the right place? Instead of complaining about technology that probably isn't available just make do with what you have.
Everyone else making videos with DSLR's and any other cinema camera do it this way, why can't you? If you think the lack of this feature is what's holding you back from making great videos then you should go ahead and find a different gig.
And about switching to Nikon, I don't think switching is going to make the slightest bit of difference. It seems like you want to blame the gear, a feature (or missing feature), and that could go on forever. So like I said, try and make do with what you have, plenty of other people have made great stuff with the same gear.