They don't need a retcon, they just need to make it a different character altogether. Have Bruce Wayne, but don't have it be Nolan's Wayne that Superman is in. Nolan's Batman can probably be best viewed as a miniseries. It told a three part story and resolved the character which for Batman actually is possible and less so for WW or Superman that are both Super regardless of effort. It was a character study wrapped in the clothing of a Superhero movie. But it doesn't fit well in a Universe designed to be ongoing. It's also a very specific taste.
Essentially, the problem you see with Supes and Batman needing to be fleshed out is how we know JLA really isn't... well ready. If you're going to throw that many characters together, you can characterize all of them but you can't do the grunt work of massive backstory. Avengers really only had time for Widow/Hawkeye (mainly by tying them together) and Hulk. CA, IM and Thor simply played aspects of their established personalities.
Essentially, the problem you see with Supes and Batman needing to be fleshed out is how we know JLA really isn't... well ready. If you're going to throw that many characters together, you can characterize all of them but you can't do the grunt work of massive backstory. Avengers really only had time for Widow/Hawkeye (mainly by tying them together) and Hulk. CA, IM and Thor simply played aspects of their established personalities.
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