the jet already near to 20 year in taiwan, not far from end jet lifespan, body structure getting old, not so worth to upgrade again, event upgrades used other 10 year by that time China already fully with Steal jet.
money not issue for china..... they plan go to moon only after 2020.
also they need launch new generation rocket with able to send large space ship.
expected new generation rocket CZ-5/7 will launch around 2014 for first time, it can carry more than 1000 ton, compare to current CZ-2F can...