Well, with the revamp of ARR's MSQ and the NG+ feature it gives replayability to a lot of old content.

I wouldn't mind a revamp of 1.0, or FFXI content. Even if it were a complete remake that condenses and focuses on the key storylines of the original FFXIV- and/or FFXI- I think it could be a pretty popular thing. Perhaps too vast an undertaking for side content- so this is less of a 'what I think could happen' and more a 'I would be interested in seeing it'.