The thing that worries me the most about XIV is that they won't have been able to make the necessary changes by V2 to give themselves room to expand. From what it sounds like, 2.0 is just going to be an improved UI and graphics engine. SE is going to have to work some magic and make 2.0 feel like an expansion, but I get the feeling that it won't. If you check the roadmap there are still things that are considered fixes that you'd expect at re-launch that are basically just fixes and improvements rather than actual content or expansion. A lot of it is coming after re-launch too.
I know you're only going from what you read, but I'm going to have to disagree here (surprise!)
For 1, the current story will not be playable in 2.0. That means they will HAVE to have a new story, right? Boom, content.
Secondly, many of these changes and improvements are being made to make WAY for better content. Take, for instance, Hamlet Defense. With the current engine, they can only display 40 character models at any time, regardless of settings and hardware specs. So for Hamlet, they took what should have been an open world event and made it an instance.
Come 2.0, they've suggested that these events will be more akin to FFXI Campaign and not instance events, making them full-scale awesome. They have to instance A LOT of things (all) currently, but in 2.0 they will have much more flexability with content.
They have been trying to keep future content tight-lipped because of spoilers to the current story. Expect that to change soon, with 1.23 and GDC/TGS
I personally would expect the following in 2.0:
New Combat types (specifically the expanded PVE such as Hamlet Def, and Avatar capturing)
New Abilities for existing Classes
New Abilities for existing Jobs
Rework of the Crafting mechanics
Better targeting system
New Inventory management (Bags)
Removal of Outdated gear and items
Custom Party grouping (configure how you reference party members for better macro design)
Macros and items as actions (ability to add macros and items to your action bar)
New looting system(s)
On or shortly after 2.0
Increased level cap (hopefully at the release, but not holding my breath)
Player linked ability chaining (e.g. Skill Chains/Battle Regimens)
That seems like a healthy list of new things to play with. I am expecting to stay pretty busy.
With a successful launch of those additions, I am expecting a healthy return of the Final Fantasy fans to the game, and with a "good" and "functioning" PS3 version of the game, it should bring in a group of players who held off for the console version.
The key to all of this will be the Beta. If the Beta is clean, and SE is responsive to issues brought up in the Beta, the game should be on a good track for recovery.
If the Beta is overly buggy, and/or SE fails to respond to the players (and I am not talking about the players that blow up the forums with their petty complaints), then we will be right back to where we were 2 years ago... SE has a chance few companies have, and it is going to be riddled with hecklers and dissenters, but, they have their second chance...