That's where I stopped too. None of the endings of citizen sleeper are particularly satisfying though.
My problem with the gardener ending is that there wasn't anything to *do*, no next step. You're basically stuck there, with no one outside knowing where you are and no way out. Plus, the fact that the gardener doesn't think to leave the choice open makes me think they wouldn't be especially thoughtful and pleasant company for the rest of eternity.
There's another big problem but that would be going into spoiler territory.