I'm inclined to say yes, her virus handling is quite popular, and gubernatorial elections tend to be a referendum on the incumbent. Plus the MI-GOP bench isn't exactly enticing. John James (assuming he loses in November, as is widely expected) would basically be a perennial candidate, at that point.
Do you really believe Whitmers Approvals will hold? I don't think so! The only thing that could save her is if Donald Trump wins Reelection. If he doesn't and Biden wins she is in an instant Toss Up Race and so is Tony Evers in neighboring Wisconsin.