They cannot under ANY circumstance allow 2.0 to become another 1.0. They absolutely NEED to ensure that there are oodles and oodles of content right out of the gate for this thing. It doesn't matter if they don't have PvP or the Crystal Tower out(we have no idea what Crystal Tower is going to entail), but they NEED to ensure that there is PLENTY to do. They also need to make sure they actually use the feedback they gather over the alpha and beta tests.

I would also agree that they need to have time frames for the things they'll be adding, and supplement those general time frames with actual details. None of the vague "we're working on adding companies soon" shtick that Tanaka fed us after 1.0 bombed.

They can add Arcanist/Summoner, and maybe even musketeer, but it won't mean jack diddly if there isn't anything to do in the world or new places to explore(more than 5 would be a nice starting point). Sorry gang, even in its current pre-2.0 state, FFXIV doesn't have nearly as much compelling content as you'd like to believe.