What I'm hoping is that they keep introducing new content, then when 2.0 comes around they bring everything up to a similar level so that there's a really broad range of choices based on what you want and for what purpose. Having really tough faction NMs that drop gear with unique trait/ability alterations etc would be really neat.
If they did that, when 2.0 rolled around we'd have:
-Faction NMs
-Dungeons
-Roaming NMs/bosses (Odin and more?)
-Primal fights
-Company quests
-Hamlet Defence
-Chocobo escorts
-Guild leves
-Strongholds
-Story missions
-Quests
-Overworld dungeons/coffers
-Ishgard content
-PvP
And maybe more as potential options for things to do, if they could each provide unique benefits or alternative progression routes. Of course some of it like chocobo escorts and guild leves would probably be complimentary to other content rather than standalone.
Edit: I should add that I don't think constantly refreshing old content is really a great idea (although hard-mode versions of primals etc in the future would be cool for even better gear), but having different options for specific niche pieces of gear etc would be cool. With a solid base like the above in place, they'd have more freedom to move forward after 2.0 and add completely new stuff (CARD GAMES PLZ).
