See, this is why I like this place. Quick and easy way to see which predictions are reasonable and which aren't. So to update my priors:
2023
Republicans will win in Mississippi and Louisiana, but Andy Beshear will squeak through into a second term (making him a front-runner for the 2028 national ticket, probably as Harris's running mate).
2024
Democrats will pick up one governorship as Chris Pappas beats Chris Sununu in New Hampshire. In Washington, Jay Inslee will not seek another term and Steve Hobbs will take his place. Trinidad Navarro will win the governorship in Delaware, and Josh Stein will be the new governor of North Carolina.
2025
Josh Gottheimer will be the new governor of New Jersey, and Abigail Spanberger will be the new governor of Virginia.