But, this would not work with Brink, mostly because of the addition of parkour, but also because of body types. Level designs for other games wont have anything included for vertical or dynamic movement, nor for characters with different speeds.
Not to mention that SD has said that their maps are being made from scratch with players being able to react with anything in a way you would expect. Unlike some games where there are crates that you can climb over, and identical crates you cant, or waist high objects that you cant jump over for a mysterious reason via invisible walls; if a designer makes an object that doesn't interact with the smart system as expected, they wont put it into the game.
Finally, I am not a fan of paid map DLCs in multiplayer games, it means that if a friend buys it, and you don't feel like paying for it, you are not able to join your friends room. I suppose I support free map DLCs, but I don't see that happening in today's video game industry, even though I tend to think highly of splash damage's community support.
I am a big fan of weapon or customization DLCs, though, especially if its true that there are no weapons that are stronger than others. If SD offered a weapon that is simply different than stock weapons, rather than actually stronger, then players would have the option of buying it if they like it, without being owned by players who buy it (if you choose not to). A paid customization DLC would be the epitome of optional; if you like the look, buy it - if you don't, don't.