Beyond the facade, is there really much left to deteriorate? If you do a google image search for the terms Isis Theater and stockyards you will find several photos of what is left of the inside of the theater: very little.
Here's a page where many of the images in the search come from: http://flickrhivemin...sis/Interesting
The projection booth seems to be more or less intact. The auditorium is a complete loss. The mental seat frames at the ends of the rows look like they were ornate and could perhaps be salvaged and reused. Everything else is little more than debris. The roof is completely shot and daylight shines through in many areas.
Any reuse of this building would require completely gutting whats left of the interior and essentially putting in a brand new building inside the shell. It is way beyond remodeling or repairing.
The current controversy over the Lakewood Theater in Dallas is the proposal to chop the interior portion into restaurants. Too bad the situation is not reversed. The Lakewood has a lot of nice original details still intact and seeing it chopped up would be a shame. Based on what I can see of the New Isis what was left after its last remodel was anything but spectacular. It would be neat if someone could bring it back as a theater or performance space - but if someone simply kept the facade and reconfigured the interior as something else I think that would be nice too.