You really think pro filmers want AF? I've been in the industry for years, both video and photography. The reason why filmers prefer manual to AF, is because AF tends to drift in and out of focus. If you want a solid focus, use manual, mark it, and than you can choose your focus points. AF won't work 100% of the time, it'll sometimes take quite awhile to focus on a subject. Once you master MF its game over.
Ask any videographer, 95% of the time they'll say MF over AF.
The T3i an entry level camera, has way far superior video capabilities than lets say a mid level Nikon such as the d300s. T3i shoots 1080p at 30fps, while the nikon can only do 24fps at 720p. T3i can go up to 60fps in 720p, which is unheard of in any Nikon camera, except for the D4 that just came out. Thats a $600 camera compared to a $6k camera. I'm saying performance wise, Canon has the edge over Nikon when it comes to video.
Now if we we're talking about shootings stills, yes Nikon has the edge over canon. Image quality is far more superior, Canon may have the upper hand on resolution, but what consumer really needs 20+ megapixels?
Canon and Nikon, both make great cameras. I'm not saying one brand is better than the other. I myself shoot both, I'm a nikon guy for stills, a canon guy for video. If nikon had a superior camera for video that wasn't as expensive as the d4, than yes I'd be shooting strictly nikon. Both brands have their own advantages.