I suspect he would go down in history as a competent, but unspectacular general and end up either dead or a Soviet prisoner (unless he joins the Stauffenberg group). Rommel owes his stellar reputation to luck and staging as much as competence. It's not that he was bad, but there were others as good who didn't end up being in sole charge of a major, sexy, exotic and big theatre of war where victories were impressive on the map. He'd be someone WWII buffs recognised: "Rommel, the guy who commanded HG Kaukasus? Didn't he write a tactics book?"