actually...it also depends on how much mass appeal yours shots have...coz if they dun...u simply dun get assignments... then fulltime photography would fulfill your dream, but cant feed u....wats the point in tt case.....
Sometimes, i think going full-time needs you to be 70% biz minded and 30% skillful. Unless you have hell of a talent in photography.
Why not go part-time semi-pro first? Much less liability and risky. After starting off with some shoots, about 10-15K a year isn't a problem.....many people have done it.