A 24 hour extension is probably an indication that what's really being considered is a longer extension. You don't take a 24 hour extension to do a deal. It won't get done in 24 hours.
You take a 24 hour extension, because something new is on the table, and one side says, "let's take a look at this and decide whether this constitutes the kind of movement we need to keep negotiating."
As a fan, do you really wan an "unmovable" deadline? What I want as a fan is a deal. I'll sacrifice uncertainty for a better chance at a deal. If the uncertainty is too much for a person, get your doctor to give you xanax. This extension is good news. Hopefully, tomorrow, we'll hear there's a longer extension, because that would be a sign that whatever movement happened today is worth talking about.