Here's a suggestion....
I know this could never happen, due to legal issues and whatnot, but since so many people think AOD is inferior and they prefer the classic TR games, wouldn't it be great if Eidos released a "Special Edition" of AOD that came bundled with a "Best of The Custom Levels" CD for PC? Imagine how little work that would take on Core's part, and how many great "classic-feel" levels they could fit on a CD-ROM!
Anyway, like I said, I don't think it could happen unless Eidos sets up a "Level Donation" site, and specifically states that all donated levels will become the property of Eidos. I suppose they could do it as a contest, awarding a monetary prize to the winners, and of course, those winners would also get the glory of having their names on the credits.