I can't decide if Covenant's performance will affect the film's chances or not.
On the one hand, if it's a huge success, there's a good chance they'll want to stick with Ridley and focus on his series.
On the other, if it doesn't do well, maybe they'll decide to take a chance on Blomkamp and go in a different direction.
Having said that, it's success could just as well fuel Blomliens.