Edit: Now that they don't have to focus on building 2 games at once, they can focus all their man power on 2.0. By 2 years, there should be at least 1 expansion, 8 Major Patches. We should have by then:
1) Ishgard ( Jeuno of FFXIV)
2) Ala Mhigo
3) Frontlines
4) Coliseum
5) Full Length of Crystal Tower
6) Full Length of Coil
7) Multiple Tiers of Relic weapon
8) Continuation and ending of FFXIV ARR Main storyline
9) Expansion Storyline
10) Sky or Sea from the Expansion ( we don't know which one yet)
11) Level cap rise ( Probably 70-75)
12) Myth cap will probably be gone by then
13) New content within those 8 patches ( perhaps something simular to Limbus/BCNM/Dynamis etc etc)<--- Guessing on this one
And probably other things we just don't know about yet
When you look ahead 2 years from now even if the subs drop to 300k ( Yoshi-P initial prediction). When 2 years come and go, people will slowly make their way back to a potentially awesome game.