It's a very good suggestion, but a hard one to realize.
Getting a higher resolution from the graphics library is easy. The problem is with the hardcoded UI sizes. Most of the game, especially the GUI, would have to be made much more flexible to adjust to different resolutions. It wasn't designed flexibly from the start.
I have no problem with game balance. Right now, better keyboard, mouse, faster computer, faster ping will already provide advantages. If someone is able to select a higher resolution, he should be able to. :-)
-- Simon