I'm a Texas Ex, he did not bury the program.
Poor decisions by ADs after his firing hampered the program tremendously. It was time for both parties to part ways, Mac was stale and UT needed a new spark, unfortunately Teddy Bridgewater turned pro and Charlie Strong couldn't transfer him into UT. Tom Herman was the perfect hire on paper but did not live up to the hype, hopefully Sark gets it done.
But let's be clear, Augusta_Jacket only showed the last 4 years of his tenure and those still look decent. The 6 years prior he played in two national championships and 2 additional NY6 bowls, winning one championship and winning both the Fiesta and Rose Bowl. He was a really, really good coach who regressed to just being a really good coach before UT put him out to pasture.