Urban Meyer will be okay at Ohio State for a while, but he will find it hard to maintain his very high standards for very long--especially in today's world. Meyer has not been able to keep a good coaching staff together, and he is facing more competition with other Big Ten schools now that they are out of probation or have improved coaching staffs.
Dan Mullen has the advantage for now assuming Willie Taggart does not assemble a vastly improved coaching staff on a shoestring budget, and assuming Mullen can beat Richt and Strong on the recruiting trail in-state, and beat Alabama, Georgia, Auburn, and the rest of the Power 5 who have been raiding the state. Once Mullen does this well a few times he needs to keep his core coaching staff together. His mentor, Urban Meyer, saw his coaching staff fall apart in year 4. Granted, coaching staffs will change over time, but look at how quality coaches are replaced. Was Steve Addazzio a good replacement for Dan Mullen in 2009? Was Addazzio that good of an offensive line coach without John Hevesy? The answer is no, of course, and the offense slowly got worse. Watch this coaching staff over time for signs of repeating Meyer's mistakes. Mullen kept this core of Hevesy and Gonzalez together since 2011, and worked pretty well with Geoff Collins from 2011 until he left for Florida in 2014. Todd Grantham only had a year with that core, but he always to be part of the gang. As long as Mullen keeps Hevesy, Gonzalez, and Grantham together and he replaces his other assistants with the same quality, then I can see the Gators doing well for quite some time.
One final note on Urban Meyer: despite losing a few key recruits he still has the #1 class and his defensive coordinator, Greg Schiano, is ranked as one of the best recruiters in America. Meyer is loading up.