I am not sure why there are so many freak outs and threats about switching to another brand.
When canon releases them they will be a solid reliable product. THey may not have the most cutting edge features(that seems to be Canon of the past) but they will be reliable, solid, functional. Thats what i want out of a product i am using to make money.
If i have constant camera errors i become and unreliable person to use no matter how good i could be.
I do my living with that too and honestly I have NO idea what-so-ever what PRO brand have you used before Canon. But I know the following for me:
I am in a need of upgrade. At the moment dollar-per-feature is not good enough with Canon for my needs. Even now as rumors I might get a new sensor offer and a video servo focus (that I don't need that much). A better ISO (probably - having in mind the stupid 4 year cycle of their sensor generations) an incremental increase is to be expected. 4k - hopefully and it is really pain in the ass to have to wait for every one competitor out there in the pro market to be before your own choosing of brand.
Now my competitors on the market can offer better service, because they use different brand. This of course leaves me without the option to stay topcat in my field.
And slowly I have to begin to miss my lead and stay behind and that is about image and name... For the moment I am the only to realize that. In beginning of next year I might jump ships because my competitors might find out as well.
My creativity suffers as well. I know that there are features I can test out... but will have to wait. And no - I won't rent - because these are tests of well known features that will soon or later be mine as well and I don't make money out of tests!