That 5% undecided will go at least 4-1 Trump. As long as Trump has a nominal lead in the GA polls, it's very hard to see him losing the state.
This isn't the first time you've asserted this, but trust me as someone who lives here that it's a very shaky assumption. In any other year you'd likely be correct; but Trump is
not a normal Republican candidate, and he turns off many of the automatic Republican voters in the Atlanta suburbs. The level of enthusiasm for him in those areas is dramatically lower than that for Romney, McCain, etc.