As far as "attendance woes" and people claiming parking is an issue, I and many others parked nearly a mile away for an @OU game and it was packed. I've never parked more than 3 blocks away from a TU game.
Remember when Todd Graham voiced frustration that TU beat Notre Dame then came home to an empty stadium? And that was one of the best/most talented TU teams in the last 30 years. 10-3, blew out ranked Hawaii and lost to ECU on a last minute hail mary. TU stands were pretty sparse after that one early loss - 19,000 announced attendance and it didn't recover much that season as crowds ranged from 16k to 23k.
Even when Kragthorpe turned the program around in 2005 & 2006, there were a lot of games with only 15k-17k attendance. This is just a very small university with a small fan base that has probably diminished a bit with the prominence of OU/OSU. There are ~31,000 living TU alumnus vs ~200,000+ each for OU/OSU. Being an academic/private/international oriented school doesn't help either as most students don't care much about football. But even if they were all 100% engaged, that's maximum 3-4k students which won't make a dent on a half empty stadium. CFB attendance has been on a downward slope for decades since DVR and HD TV has taken its place for many CFB fans.
In 2008, TU was 6-0 and went 7-0 in front of 22k fans. After losing, attendance didn't go over 23k again. Then in the CCG at Skelly, 10-2 TU played in front of "23k" announced fans (but looked more like 17k if you were there). It was quiet and really was not a home field advantage. If you can't at least get 25k-30k for a home championship game or to celebrate an undefeated team, what could possibly make people show up?