It will take at least a decade to get back to where Houston was a week ago.
If ever. Not criticizing the people by any means, so many have lost everything they had, but one of my pet peeves for years has been the constant destruction of the wet lands, and riparian buffers along coastal waters. In this case I doubt even storm surge protection would have helped though, because the latest reports claim they had 52" of rain, but it might have helped. I am critical of the politicians, that gave waivers and changed laws that allowed developers to build in areas that should have been offlimits to prevent such catastrophic destruction.
I suspect that many of the areas destroyed will be allowed to revert back to nature when the flood waters recede and the rebuilding starts.