Personally i think the Void with wrap up in the patch cycle, possibly with a rejoining/ calamity / world changing event that will lead into 7.0. Whether that is Meracydia, the other half of Islabard or the New World remains to be seen. But I wouldn't be surprised if 7.0 is our formal farewell to Eorzea, it probably wont be, but it does seem Eorzea is mostly wrapped up and visited now.

Its hard to see how Eorzea would remain relevant in The New World or Meracydia without Garlemald being the ol "common foe" glue.