How do you think, will it be more difficult to make a model for 2k7 now, with the amount of poly's being increased a lot for normal mesh models?
Also, I'd like to suggest to add an option in player's settings to specify a fallback model. In UT and UT2003/4 if you use a custom model, other player does not have on his/her PC, he/she will see you as if you 're using of default characters. Due to that fact though some players like most one of the custom models, they stick to a standard model they like most, because they want others to see them as they like.
A simple fallback model option, that would allow the player to select the preferred model from the list of standard ones, in case other players don't have custom model he uses, would've solved the problem.