I wouldn't do it and expect to make your money back before 3.0
However, getting geared up right now will give you an advantage right after launch when prices of mats will be inflated. It also means that you can stall gearing up in the new gathering gear for a little bit, and I'm going to assume that those new gears will ALSO be inflated very much in the beginning..

So, if you have any interest in earning some gil by gathering, just gear up slowly and try to be 3 star ready by 3.0 it SHOULD pay off once 3.0 launches and prices on new mats are inflated for the first few weeks, just don't expect it to make a huge difference right away.