R_J_K75
Legend
There are other systems, such as GURPS, that allow this to take place. D&D, however, has certain basic features that make it D&D - and classes are one of these elements.
There are reasons why D&D has always been a popular system. Fixed classes is one of them. By removing these features, it is no longer D&D. At that point, better go to an other system.
Traditionally D&D has had classes sure, but I always put the idea of a players unique character, i.e. background, quirks, personality, goals and motivations above what class they were playing. To me its not that one dimensional, so I disagree that by removing classes no longer makes it D&D.
Regardless, I think were beating a dead horse here.