They actually dissolved after the 2001 season. After Les sold the organization back to the league, they actually barnstormed around the country for a season, despite nominally still being the "Houston Thunderbears."
The entire league (the Continental Indoor Soccer League [CISL]) folded after the 1997 season. There are no Texas franchises in the current existing Major Indoor Soccer League.
My bad. I thought Dallas disbanded after its league ("World Indoor Soccer League") fell apart. Did they get picked up by the MISL? Incidentally, I don't know ANY of this stuff...just have a couple friends who have all these URLs bookmarked...