Canon didn't abandon their video market at all. They have the most successful line of cinema cameras going (no, I don't have sales figures, but based on what I see at and hear from rental houses and owner/ops). The C300 is very affordable but if you are looking to buy multiple bodies the C100 is ok, too...
I don't see why people think Canon has abandoned this market. They haven't at all. The video quality on the next round of 7Ds is irrelevant, although they will be used as b cams, because they are already good enough for broadcast for stealing shots. The majority of the broadcast market will go to Arri with Canons on the low end and as additional unit cameras.
The video quality of the C500 successor and C300 successor will be what to watch... this is where Canon's "cinema" video market is and if the C500 is excellent they might be able to reclaim a bit of market share from Arri, which controls both broadcast and theatrical.
The C100 is the low end of its owner/op market, displacing the 5D II, which accidentally catered to this market, and is popular for wedding videography and low end corporate/web.
The A7s and GH4 are probably fine hybrid cameras, but it seems odd to switch when Canon has the healthiest ecosystem and best (and uniquely, delightfully single-purpose) products and by far the cheapest professional cinema camera with the C300. (The F5 is not cheap!)
Thank you for your reply. Yes, upgrading to the C series is definitely an option, but my gripe/complaint is that Canon has stopped innovating their DSLR video capabilities. They teased us with the 5D2 and then continuously dropped the ball on every single DSLR since on the video front. Not everyone can afford C series cameras and cine lenses. Why couldn't Canon continue the revolution they started? What was wrong with making the 5D3 even more awesome for video? I do not believe Canon thinks video is unimportant. I think they're just protecting their more expensive products by gutting the lower-end ones. Our company is not a full movie studio so moving up to an army of C300's isn't feasible (a few C100's, perhaps). IMO, Canon has indeed abandoned the DLSR video market in favor of greener pastures (can't blame them for wanting to make a profit). If Sony and Panasonic can do this (and they also make pro cameras), why can't Canon?
When I referred to the A7S and GH4, I was purely referring to them as video cameras (serious still shooters would wisely go with other options). These two absolutely kill the 5D3 and have advantages over the 1DX (low light / continuous autofocus / better audio solutions / 4k 4:2:2 recording).