Leonsis does talk about plans for the old arena. Some conversion of the space as more live event space and also a venue for the Mystics. Monumental says that having to lock in 80 plus dates for the Caps and Wiz constrained live events they could stage.
I would believe that except for the fact .... why wouldn't some of those events just go over to NoVa? Still near a population center and a lot more premium seating.
DC's problem is I think there will be a guaranteed massive drop off at Cap One. But DC will still need a major indoor arena, meaning it will survive in some sort of purgatory.
DC would have been better off with the Caps and Wizards moving to Richmond or somewere like San Antonio. They're in the suburbs. There is no "Go get another pro sports team!" option.