Georgia could never defend itself from Russia...at least for the last 200 years. It's also apparent they will never be able to do so.
While I have nothing against Georgia, and am NOT a fan of a newly aggressive Russia, I do recognize the FACT that this is clearly within their sphere of influence. They have legitimate security interests in the Caucasus region...to include Chechnya and Azerbaijan.
Only an incursion into Turkey or Iran would cross the threshold of acting outside their historical sphere...and into international (and US) interests.
We have a POLITICAL interest in seeing a cease-fire around agreed borders and that's about it. Short of mutual agreement on borders, we have an interest in avoiding a power vacuum in the Caucasus.
And interestingly.....Russia has already named the US, Turkey and Israel has co-conspirators with Georgia. The want to make sure all their propaganda machine is firmly established, if this does indeed escalate. Russia won't screw with the Turks, they know that will give every reason for NATO to bring the hammer down, and for us to sortie airstrikes from Incirlik, Merzifon, Diyarbakır etc. However, I fear you're correct that we will do nothing but sit on our hands until/if the make a move toward the south of Georgia.