Or temporary caretaker manager.
In 2018, the plan was to replace Ole at season's end with Pochettino. The same way replaced Giggs as caretaker with LvG a 4 seasons earlier. Solksjaer was never supposed to be the permanent manager. But to be fair play to him, he steadied the ship for a couple of seasons, rebuilt the squad with serial winners, bought plenty of youth to carry us forward, got us consecutive top 4 finishes for the first time since Fergie, and raised the standards to the point where the fans are expecting this team to be challenging for the title. Ole's failing is that he's simply not been good enough to take that final step.
This season, he's underperforming on last year despite having better players. So the problem isn't that he's totally clueless - because he's already proven he can get worse players in the top 2. It's that he lacks the charisma to motivate Champions League level players in the way he previously motivated Top Four level players.
Unlike Moyes, LvG and Mourinho, Ole is going to leave Manchester United in a better state than he found it. Not bad for a "legend".