I’d be very surprised if RJ is kept aboard. The trilogy might still go forward—but I’ll bet it’s with a different director.
The trilogy only exists because of Johnson, and as a way to give Johnson more to do for the franchise, so I doubt that would make any sense.
Not to mention, TLJ has been the smoothest production any of these films have had thus far, and resulted in a big commercial and critical success for the company. Obviously the film has been divisive for fans (to what extent is up for debate), but I’d wager that A) 80% of people going to see these movies have no idea who directs them, and B) most of what made TLJ divisive was his treatment of legacy characters, which presumably wouldn’t factor into his new trilogy anyway.
They could still cancel, but I’d be pretty surprised if it had anything to do with Johnson.