you would be spot on if this is the only home game Georgia would play at a neutral venue. Then the Italians would tell FIFA what to do. However my understanding of the rules is that all georgia's home games would then be played in Germany. In that case the Italians would be happy for us to play there.
I think FIFA will postpone the game as predicted earlier in the thread. They will threaten the georgians but will not take action. Then come October if Tbilisi is OK then all games will be played there. If not then they will really nominate a neitral venue.