I think Mourinho is going to be very likely to leave the team now. He seems ready for an offer from PSG already as it has been on the news for a long time. PSG must have been thinking of replacing Galtier after this poor season already and Mourinho is surely among the best candidates for the job. Mourinho's style is a little more different from the managers they have had so far though. But I think Mourinho would also feel the need of adapting to the environment a little.
In the end we shouldn't see Mourinho parking the bus easily with a squad like this one in hand.

No matter Roma won the Europa League title or not I was going to expect him to leave. Because taking the helm at PSG must be much more attracting to him instead of staying with Roma. He can do the things in his mind easier there.