Meracydia may be a 'wasteland' but that doesn't mean it would be devoid of content.

I could easily see it being like IX's Outer and Forgotten continents. Mostly ruins but still home to small settlements of the descendants of those that survived the Allagans.
It would be the ideal location for a forgotten tribe of summoners (after all the latest SMN quests involved those who summoned forms of the Meracydian primals), and bonus points for something like the Iifa tree (Sephirot's followers involved of course)
Buried Allagans repositories (I know, yet more Allagans) are a given.