There are plenty who would do a better job as a lone forward than Berbatov, that much is obvious.
I dont think we bought him to fill in for Rooney though. Thats just where we've found outself after his position last season failing (link between midfield and attack), his lack of goals in big matches, and our midfield. Since the summer we've made the best of a bad situation to some extent. And Berbatov has proven himself to some extent - in easier matches as a parter for Rooney. And against Bolton he proved he can play as a lone forward against easy teams. Its still miles from what we had intended when we smashed our record for him. Truth is, most people were expecting him to step up and be better than he was at Spurs. But week by week the expectations have dropped.
As it is, he really doesnt offer enough for a player on high wages. And I think that'll be a huge factor with regards to his future. Get a goal and put in a good performance against Bayern and he'll certainly buy himself time. But not do a great deal and for me, enough is enough. Because we didnt buy him as a bit part player and backup, he was purchased as another star player, a first team star player and a player to play in all kinds of matches (See last season where he started more big matches up front than either Rooney or Tevez, because Rooney had a few on the left). Recouping anything on him will no doubt be put towards what we already have to spend and we can go with something which fits our needs much better.
If we want to carry on with the 4-3-3, 4-5-1 formation then we can get a player like Gourcuff, Ozil, Silva or Jovetic to play as the attacking midfielder/link man and each of them could also be an option out wide.
If we wanted to improve our 4-4-2 so that it wont be lame against other sides with 2 in the middle and would put up a good fight against a 3 in the middle, then if we cant get Fabregas we should get Ever Banega. A midfield of he and Fletcher or he and Carrick would give us a lot more control and keep the team moving much better whilst holding on to the ball better and creating lots more chances from the middle of the park.
Berbatov's wages would no doubt come in handy for the negotiations, and we have Macheda, Welbeck and Diouf coming through as backups as well as Owen able to do a job if we need more experience. It may be we dont need to sell to bring in other big name players, thats just what I expect will happen. And if it does, you better believe Berbatov's name is near the top of the list at this point in time, until he completely proves himself against all teams - not just the weak ones, where other players could also do just as good a job, maybe better.