Well he could be "improved" in the same sense that Ock "improved" spider-man. Ock isn't really "superior". He just doesn't hold back and doesn't give a damn about human life. He runs new York like a dictatorship and will kill anyone who stands in his way(not much of an improvement) A similar mindset to Harvey Dent, in this case, Dent will have all the resources of Wayne and all his skills and memories to put Gotham in his pocket, or "save" Gotham like what Ock is trying to do.
^ ah I get it now. His crazy is a serious liability in a brain swapping venture, more so when having to swim threw someone else's memories/life. Would be interesting if he developed a new personality. A 'batman' where he actually thinks he is Bruce but without the moral obligation. Would make telling him apart from the 'real' Bruce a little tricky.