Almost 8 ... and yea, it will continue at least that long in development. That said - DC could have ended development anytime in the past year or so and called it "complete" and then just made DLC and bugfixes. And then make some big announcement about a reboot a new version in 16:9. That's what a lot of devteams do. Think of all the games you play - indie on up to AAA - and the years of additional patches, "additional scenes", "director cut", etc that are pushed out.
Honestly, it's no different - but looking at it under a different perspective.