We aren't going to only have the 7 classes (5 DOW/2 DOM) forever. New classes WILL be added. Yoshi P already said that the next CLASS (not job) to be released will be some sort of Mage class because we need more mages. So no worries, there WILL be new types of weapons, Scythes, Daggers, Guns etc.

Jobs will be built out of the New Classes and Current ones...and as the game progresses, Jobs will require more and more base class requirements, making them more complex.

The system is working as intended, and it has potential to be very cool. So worry not, Thiefs, and Redmages...it will all be okay in the end.