Sorry this is long, but hey I broke it up and it isn't one giant paragraph.
Something I just realized, which has probably been in one of the 10,000 posts in these threads...
If a coach is fired/announced as not returning, multiple things can start happening:
1. Said coach can be rumored/linked to other programs
2. Current coaching staff can be rumored/linked to other programs
3. Interested coaches can be linked to the opening/upcoming opening
By not firing CBJ, nor announcing he is not returning, you prevent those 3 things from happening. None of those are happening. There is no rumor mill, nothing on the major sites from what I can tell.
No coach nor their agent is going to leak to their media friends that they have interest in the UT job when there isn't an official opening. It's an unwritten rule of coaching. You don't pursue someone else's job while they're still in it. It's a bad look. Likewise, it would seem unwise for the current staff's agents to leak to their media friends (in targeted other markets where they'd like to land) that they are going to be available... because they aren't currently available. And it's the middle of the season. Distraction for your program and the one you want to land at.
Now, onto interim coaches. I don't know how rare it is, but I'd bet sometimes you take the interim job in hopes of earning the full-time gig. Depends on a lot of factors, why the head coach is being fired. For example: personal misconduct vs. the whole program being a dumpster fire.
If the whole program is a dumpster fire, it's unlikely even if you do an amazing job, that you get the full-time gig. AD most likely wants to clean house anyways.
Of course another reason to not take the interim job would be if you know there is no way you're getting the job... because it's already filled. So why take on the added stress, the (minor) black marks on your resume, etc.?
I just keep coming back to either Currie is a genius and has this on lockdown or we are literally the most dysfunctional university on the planet. Here's to hoping it is the former...