Getmeupthere, your chances of becoming a pilot, even from where you are now, is probably better than becoming an FC.
Seriously they still have an horrendous failure rate and most of their intake have aircrew apptitude but not the full medical quals to go with it. You are given basic training before being chopped as a controller. Then you are trained in systems before being chopped from that too. Then you get to do a tour of the air force branch hunting before returning to OASC.
OK, that is the cynical view and is possibly wishful thinking from people who either didn't really want to be FC or find out they don't when they get there.
Rather than go for FC with its high risk of failure, have you thought of admin/supply/ops support? They are much less aptitude based (except ATC) and possibly more relaxed about a branch change later.