It would make a lot of sense (to me) to keep disc brake mounts on the frame (but not stock with disc brakes, they are also much more expensive), its not like this is a major $$ cost but having that versatility there is very worthwhile and marketable. Road/cross bikes with disc brakes are getting much more popular around here (pacific NW), in fact thats what I'm bulding right now. An affordable Ti frame for this application would be ideal (and awesome).