What I hope happens is that Fleck and Coyle meet, possibly for breakfast, and Coyle tells Fleck that he needs to let his OC run the offense like he lets Rossi handle the defense. Doesn't need to be totally hands off, but he needs to delegate far more authority. Then PJ needs to decide whether he wants to hitch his wagon to Harbaugh or find somebody else. Before the AK transfer news, I was leaning toward the "keep the OC to try to build some continuity" side of the argument, but since all the QBs are leaving, he should feel free to change course, again, if he feels that he needs to do so.
But Coyle needs to set the expectation that, starting next season, there will be a viable offensive system to recruit to and a demonstration that they are back on course or there just might need to be another conversation after next year about whether Fleck is the long term answer as HC. Fleck's contract "extension" this year should reflect that in the one area that really matters, terms of the buyout.