But, we didnt win the championship three times in a row before...
We are not as desperate as before, we are amongst Europe first 15 choices and a sure bet to get an easy title.
Allegri consistenly got his Milan teams to finish where they should have, except when Juve won the scudetto in Conte's first season, but there were valid mitigating factors for Milan's failure to win that year.
I feel there would be more chance of things going horribly wrong under Mancini. And I'd suggest Mancini's track record indicates he is not particularly likely to improve on Conte's record in the CL.