Don't worry too much about Houston being able to take care of our own. Because of the evacuees the infrastructure is already in place. The donations have been unbelievable, they've had to turn away people donating for the time being. Also, Houston has consolidated the three major shelters they were using into one this last week because they've managed to place so many of the evacuees in apartments and in other places.
I remember when Carla came through and my sister has told me lots of stories about Alicia. Remeber how big Houston is and unlike NO, we've got schools and other buildings that can be used as shelters while the storms is going on.
It wouldn't be fun, there'd be damage and things would be bad but I don't think we'd be looking at near the problems we're seeing in NO or Gulfport/Biloxi.
Galveston might be another story though depending on how big the hurricane is and exactly where landfall occurred.
We'll just have to say our prayers and hope the US doesn't suffer another Katrina anytime soon and that any hurricanes that hit the Texas coast go in at the stretch around Corpus and Brownsville that isn't very inhabited.
(Y'know, it's hard not to talk as if I still live in Houston when I was raised there and still have close family there. Sorry about that!)