They'll show up to hear what he has to say and air their grievances . Human nature. I also assume that meeting was already scheduled. 7:00AM team meetings pretty common during the school year.
I actually don't have a problem with the way he's handling this. Dude may have just damn near doubled his salary. At a place that should have everything he needs to be even more successful than where he's been. I think 10 out of 10 of us takes that deal all day long. Especially in a year like this where there's a possibility that ND's built in advantages (brand name that gets them the benefit of the doubt in a lot of beauty pageants) may end up being outweighed by their disadvantages (no conference championship and academic limitations).
Shit leaked out and what was he supposed to do? Sent out a fairly sincere sounding group text apologizing and said we'll talk about it in the morning. Seems like he's handling things a lot better than the way that bitchass Riley handled things. And unlike Riley, it sounds like he can honestly say he left for a lot more money and it was too good of a deal to pass up.
And yeah, if LSU says, "We'll give you all this, but we need you to start right away" vs. riding out the current situation at ND in hopes that everything goes just right and they get into the playoff, to most likely get beat in the first round again...you go ahead and leave.