The problem with Texas is that they set very high expectations. Texas is THE football team in Texas. Texas loves football. 100k crowd stadiums to watch high school football. They act as if they invented college football. Thus the expectations for Texas football are through the roof. They are not supposed to lose to Iowa State or any other Big 12 teams other than OU (and even 2 OU losses may be too much for Texas fan)
That being said I think Sark will be fine there as he has repaired his image since leaving my USC but it depends what they do on D. I think Sark can be fine if he handles offense and allows a bright young mind or experienced individual to handle D. Texas had some of the worst D ever in the country during Herman's tenure. They routinely gave up 40 PPG in Big 12 play.