To say this, what he posted was really..really bad. And that I won't go onto what it meant, as people fan find the images and sources of what he said elsewhere, but that I somewhat expected this to happen.
What this means for the future of the Guardians, varies. In the immediate, I am guessing that Guardians will still continue on; but will not come out on it's target date.
Guardians is still a large franchise for Marvel; and I imagine they'll want to keep it going, regardless if they need to change how some things work.
What I am concerned with, is the galactic portion of the MCU, as he was going to oversee a part of that (was mentioned in interviews); so my curiosity strikes to what they are going to do for that front on the large-scale.