The Dynamo draw about 19,000 per game, middle of the pack in MLS. I'd hardly call that "zero support".
UH has had more than a single decent football season - I think they were 11-0 at one point in 2011 or 2012 and thought they might make a BCS game until Southern Miss put them down. They opened their new stadium on campus last year and drew very, very well. They've also made some commitments on the basketball side in terms of facilities and coaching. THAT program has actually had zero support but at one time their pedigree in basketball was just a notch below UCLA's, and in one famous instance, better than the Bruins. They also have a very good baseball program that has good fan support.
That's not to say they're the best candidate. I'm on record saying their candidacy is built on the momentum from their football season last year, which might be what you're trying to say. We also agree their academics are not up to par overall and they offer nothing new to the B12 other than proximity. Their campus is on the wrong side of town, etc. In my view, UC is the best candidate in the field for a variety of reasons, but that's not taking anything away from what UH is trying to do. They might be the #2 candidate depending on what the B12 thinks is important. Who knows.