[shauner111]

Because Nolan wasn't into making a third movie until they were able to create a story that was 8 years later with Bruce older and concluding his story. Im saying there's a chance that he would have wanted to use Joker in a significant supporting role (or lead) and would pass on it because he would fear repetition.

If Ledger was alive, the 8 year Dark Knight Returns may or may not have happened. And that was key to Nolan returning one final time. But no matter what, Bale was obligated to do a third and Ledger was obligated (so i hear) to do another.

We just dont know. Im speculating that's all.

Goyer may not have brought Bane to Nolan either if it wasn't for their mentality of "no Heath = no joker".