I've been waiting to reply to this all week!
Uninstall?
YES!
Seriously, though, if you don't even play it, what's the point? If you're waiting for some magical time in the future in which the game will actually have a following, I'm afraid you'll be waiting forever.
Patch v1.3, if it ever comes out, will NOT take the community from barren to lively.
That said, single-player games do not need to remain installed if your only concern is space. Install it, beat it, explore it some more if you want, but uninstall it soon thereafter.