I tend to agree with you that even promising membership today is a step too far, but I see a tiny bit of hope in Martin's point (which can certainly be communicated discreetly to the Russians).
The advantage being that if the Russians have even rudimentary map-reading skills they will incapacitate themselves laughing and thus cease to play a strategic role in the world.
Maybe I'm missing something, but it seems to my naive eye that geography makes Georgian NATO membership such a patent foot-and-firearm proposition that I find it difficult to consider any other aspect. "Ideas or the lack of them can cause disease." - Kurt Vonnegut