Well like Minecraft I don't think this game will ever be done, they can continue working on it and making it more amazing.
TF2 is still being worked on,
Don't starve is still being worked on,
DOTA2 is,
and War thunder,
etc.
The point is, as long as there is a community or a team that puts in content for the game, it will never truly be finished. That's the beauty of it; we don't know what people would've done with skyrim when it first came out, but look at all the mods!!
Who knows what will come out of this game or its player base? At the moment, we have only seen a glimpse of the whole thing.