I don't even care if Rooney doesn't leave. If Zlatan comes here he will be the top dog. His arrogance won't allow anything else and his performances will most likely put Rooney's to shame (not that that's hard). Rooney might kick up a fuss, but he'll be the man to go if push comes to shove. Part of the problem with Rooney is that we haven't had a single player with the stones to just claim the throne as United's talisman since Ronaldo left, apart from van Persie who was on his last legs anyway. Part of the problem is that there are very few players with the mentality to come to a club and be the unequivocal leader from the get go. I can only think of Cantona who has done that for us. The others we've had grew into the role when their predecessor disappeared. but with Rooney still here, it's been harder for our younger players to take over his spot, and the current bunch of players is the most feckless group of United players in decades.
Rooney's been sitting in that chair virtually unchallenged for almost seven years now and his performances stopped living up to his status about half way into his stint as the main man. Fergie always knew when to get rid of the big players for the good of the team, whether it was Beckham, van Nistelrooy, Keane or Hughes. The exception being Cantona, who realized himself when it was time and went out with dignity before Fergie had to make that choice for him. Rooney hasn't had to deal with that problem, since Fergie retired at the same time as Rooney should have stepped down and neither manager after has had the sack to do what has to be done.
Zlatan will make that easier. I reckon he has two seasons in him where he can be the leader of the playing staff and Rooney's role as Mr. Manchester United will be forgotten in the process, obviously helped by the fact that the general football-watching public seem to be catching on to the fact that Rooney's a spent force.
And on a free? Christ, I don't even care if it'll cost us a few 100k a week in wages and a nice fee to both Zlatan and his scumbag agent. What player with that sort of talent isn't on massive wages anyway? If we don't pick him up, it better be because he didn't want to come here in the first place, an not because we weren't interested or fecked it up somehow.