I think he would be crazy to leave Florida. What coach is in a better situation?... Florida is loaded with talent, his in-state rivals are in such disarray, and the only coach in the SEC that has "so far" proven to be his equal is Saban.
But, to answer the question, no, I don't think that he is preparing a run at the pros, IMO.
Side note:
If Lane can average an SEC title every 6 years and average no less then third place (East Division) in off years, that has to be considered a successful tenure given SEC quality and strength of the coaches/players.