Well, Berba had played only about 10 games this season, with Kagawa here this number can only be decreased. Powell and Macheda surely that are not ready yet, but they can play in some unimportant matches like league cup when Berbatov played this year sometimes.
3 others + Chicharito is not a valid point. Again you are forgetting Kagawa. We all know that Rooney, Welbeck, Chicha and Kagawa will fight for 2 positions. So if Berbatov stays there will be 4 + Chicharito which is too much. Also, there have been a year and a half since Chicharito is higher in pecking order than Berbatov. I also don't agree that Chicha should be used mostly as a substitute. He was extremely good in his first season here (IMO much better than Berbatov) and far more consistent than him. Also, much better in big matches. He scored many important goals when he started, against Stoke away 2 times, Stoke home, Everton home, Marseille home 2 times, Chelsea home 2 times etc. He is very good as a starter. A bad year that was mainly due to the injuries and him not having a full pre-season and not having a proper rest doesn't make him a bench player and lower in pecking order than Berbatov. With Welbeck and Rooney tired from EURO, I really think that Chicha will be in our first 11 more often than last season, surprassing Welbeck in pecking order.
Also, I don't think that we need that much Berbatov experience, we have many other experienced players. Rooney, Nani, Valencia, Young and to a degree Chicha are not anymore that young that we need an experienced forward. Also, if I remember correctly his experience didn't helped us that much when we mostly needed him (end of the season 2011). For all his experience he didn't make even in the bench in final of UCL in his best season here.
Seriously, this is one of the most hyperbolic sentences I have ever seen. Berbatov one of the most talented footballers in the world?! FFS.