Since when is a 96 foot tall structure a highrise? Some of these news reports tend to overstate these things. Its a VMU midrise not a towering highrise.
The fact that it's going to be a Pollo Tropical means we won't see anything happen for about a decade if not longer. As others have already said why go through the effort and money especially Taco Cabana corporate to rebuild a restaurant only to have it demolished in a few years? It's going to be longer than a few years or else they wouldn't bother.
The only thing that they could do is design the restaurant to where it could be incorporated into the VMU. Not sure if something like that has ever been done before but I doubt they are doing that.