Agreed, I am far from one of those "OMG EVACUATE NOW" kind of people, having lived here all my life. However, even 4 days out, if a Cat 4 is even remotely threatening the Keys, they need to get those people out of there.
You can't tell them one day before when the forecast is more accurate that "ok, leave now" because it will be too late. As much as I hate the fear mongering done by most weather people when it comes to hurricanes, this is just one chance they cannot take. If a Cat 4 was to hit the Keys head on, and as they predict (right now), sit over the Keys for almost 24 hours, you're talking about almost total destruction of the Keys.
People can't just mess around with that, even 4 days out. It's not like us on the mainland, these are people that are just a few hundred yards from the ocean and a Cat 4 would swamp them.
Fortunately, the track continues to move more and more south. Let's hope for the best.