I wouldn't have through so. After all, he had a bad experience with Chelsea in 07/08 when they sacked him after six games, then bounced back to win the treble with Inter. In general I'd expect a good manager to learn from an experience like that and use it to move forwards.
Also, as with most things Utd and Mourinho, I think people read too much into it. When Liverpool appointed Klopp no one asked it that was wise after his last season at Dortmund when they flirted with relegation, got battered in the CL and threw away a winning position in the cup. In fact his start to that season was even worse than Mourinho's last at Chelsea, but unlike Chelsea Dortmund gave Klopp the respect and the time to turn it around.