I don't expect it this time (and maybe it won't even happen in my lifetime), but I really hope someday there's a Batman movie that's fun and captures the spirit of '50s/'60s Batman the way the cartoon series "Batman: The Brave and the Bold" did, while still being modern. I don't think having a lighter tone automatically has to mean a Batman movie is lame and sucks. It all depends on the director/writer(s). Get people who are smart for those roles, and they can make something cool, even if it isn't all dour.
I still love "Batman: The Animated Series" more than any other interpretation of Batman (and any other TV series, live action or animated, for that matter), and I consider "Batman: The Brave and the Bold" to be the most logical and worthy follow-up to it. I'd like to see something like that happen with live action movies.
I'm afraid what's more likely to happen is something like the 2004 series "The Batman", which came across more like a watered down variation on the landmark achievement that preceded it. Of course it was vastly different from "Batman: The Animated Series" in many aesthetic ways as the villains and characters in general looked very different and it was less grounded in reality, but the tone made it feel pretty damn derivative. I think what's best for this franchise is something that goes in the other direction, without taking it too far like Schumacher and Akiva Goldsman did.
Also, even though I'm using animated shows an example of how to do things right, I contend that directly converting an animated property to live action is an awful idea. Especially "Batman Beyond", which I didn't much care for. I believe that show was done about as well as a show with its premise could possibly be done (of course it was, how could it not be when it was put together by the crew with the Midas Touch behind all the DC Animated Universe properties from '92-'06?), but it was in my opinion the weakest of the DC Animated Universe properties.
The main reason I didn't like it was that I found its premise fundamentally flawed. It was an admirably radical, outside-the-box concept, but I could never really get into it. Maybe I'm just too much of a traditionalist, but I just want to see Bruce Wayne as Batman. I found the speculative in 1999 future world of that show silly and the costume even worse.
To be fair, they told some great stories (i.e. "Meltdown", "Return of the Joker"), but I was glad when that series ended and its producers went back to doing what they do best, with the more traditional "Justice League", which was able to come up with surprising and intelligent character and story arcs while still being less of a disappointing departure from the spirit and premise of "Batman: The Animated Series". I personally think any revival of "Batman Beyond", live action or otherwise, would be disastrous.