No real different to FFXI being originally designed for PS2 and Windows 98 and yet getting not only a (now shutdown) Xbox 360 port (which, to be fair was just a straight port of the PC version), it is now running under Windows 10, nearly 20 years after it was first launched.

Plenty of games are such long lived they are ported to multiple successive console generations, and FFXIV would be hardly unique.