You guys are sure making a LOT of assumptions.
The deadline was today. Chun, if he was thinking clearly, would want a meeting after the end of the work day to discuss the result, REGARDLESS of what that result might be. The workday is not over, so nothing is done or decided until then. The meeting is due to the deadline, more than it is due to the message.
That said, one possibility is that 1) Rolo was not given an exemption, and 2) Rolo then choses to stick to his decision to throw away his job. That requires two sequential events, so obviously there are other possibilities, but maybe the result at the end of the day will be that our coach is gone. If so...the rest is pretty easy to predict.
If Rolo is in fact gone (and I'm waiting to see if that happens, but if so), the D staff has done a good job and so far as I've heard are all (or at least almost all) vaxxed. Dickert could easily be declared interim coach and they play with what they have. The players will not be happy about Rolo being gone, but they also will not be happy with his decision to get himself canned over a vaccine that most of the players have taken. And I suspect they will support Dickert for the remaining season, with the added bonus of proving that Rolo can put together a program (which in the final analysis will help him get another job someday). For that very reason, Rolo will also be telling them to go out and win the game, because it will be the only path to long term credibility that he (Rolo) might have available.
Based on the above (which seems most likely to me if Rolo is gone), the players will indeed play like their hair is on fire. And when I've seen this before in P5 football, there is surprisingly good focus on individual assignments in the first game with the interim guy. Consequently, the chances of Dickert winning the first game of his new career as a HC is good. If.....if....if....Rolo is really gone. I don't expect that, because in the final analysis I think he will get the shot if that is what he has to do. But if Rolo is gone, the above is what I expect to happen.