A stationary Monorail with broken tracks is the way to go.
A full working animated one zipping through town is not possible. There's enough issues now with connections, lag, images not loading, crashing, etc. Adding something like this would be a nightmare for a lot of people. It's just not feasible. There's nothing wrong with a stationary non working Monorail. Besides that's how it was on the show & honestly would be the best for everyone.
Besides do you really think Lyle Lanley would really sell the town of Springfield an actual working one? That's not in his character.