Will inactive FC and unsubbed player plots ever be relinquished?

[Jasott]

Exactly, especially when complaints are coming from people who seemingly have waited and waited and waited.. meaning they've been playing for quite a while.
If you have issues affording a house after having played for months, you need to look at your gil farming strategies.
If your world is simply full.. Well, it might be time to consider a move

And look now, if you aren't there for 45 days or the FC is 100% dead, the houses are destroyed!