I think it's more people are assuming the worst.

Plus this overall shift in leadership appears to have come out of nowhere, so it's surprising. On the one hand it isn't surprising post acquisition for a lot of higher ups to be fired or moved around, but on the other hand there were some clear signals Gunn/Safran were safe.

Also a new thread popped up today that further confirms it isn't cancelled yet, with the source being someone working on the show.