As much as I am anticipating 2.0, my vote would still be for more testing, longer Beta..
They need to QA the shit out of this thing... in every supported region....
they need teams everywhere from JP to US to AUS to FRA to GB all testing this bad boy out.....
Discover every exploit... uncover every glitch.... chronicle every possible crash.... these testers need to learn the new Eorzea down to every MOB, every pixel... Give every SE employee an account and see what happens with 2500 people on 1 server.... Stress test it....
Tell them anyone who finds a way to break the game gets a bonus....
Parse like crazy... Figure out the best setups to beat every single NM, farm stacks and stacks of every farmable item
Figure out the fastest ways to hit level cap...
And then after all that is said and done... send that thing to Alpha/Closed Beta/Open Beta testing