I don't know why most people are taking Mourinho's comments on Rooney as a negative. I bet Rooney will love those comments.
Mourinho specifically said, "the natural appetite to put the ball in the net never changes."
Rooney has a great goalscoring record, and is a few goals away from being our all time top goalscorer. He obviously feels Rooney can still contribute going forward, and I do too. There are very few 10's nowadays, who can get you 15-20 goals from the 10/9 and a half position. In my opinion, Rooney can do that, and has done so in previous seasons. Sure, his goal tally has gone down in the last few years, but we haven't exactly been brilliant in the last few years, and the quality hasn't really been there.
With the addition of Ibrahimovic, Mkhitaryan, and hopefully Pogba, I'm hoping we will become the team we once were - a team that creates bucket loads of chances per game, and doesn't have to dwell on one or two misses.