I see stories about Lemon here and there, he wasn't the figure Carlson was of course. I'm sure Fox will find a replacement, as they did for O'Reilly. I also figure to do this sort of show every night takes a LOT of staff who likely will remain. I'm sure they prepare their pitch a few days ahead of time, the guy we see on camera just reads the prompter, perhaps with a bit of editorial influence (or not).
"OK, team, we're going to do a story lambasting the COVID vaccine, OK? It will be popular with our viewers, so get cracking and cherry pick whatever you can find to hammer it and get the script going for Thursday."