So now we know that Garrisons (at least in their current form) will likely not carry over into the future expansions. However, much like the Farm turned into Garrisons, Garrisons will likely turn into something new. Be it a bigger Garrison, or a Boat, or even your own Faction. The Devs will take what they and us liked, and leave behind the things we don't.
So lets say you had the power to decide what they keep and what they trash from this feature in 7.0. Where would you take Garrisons next?