I'm sorry, but the only re-use you're going to get out of new suburbs is old suburbs - unless the bulldozer is brought in, then you're just going to start the cycle all over. Look at Argyle, for example, the older part of the development near Blanding is now mostly low $$$ rentals, elderly or 1st time buyers with no $$$. As you move farther away, the homes get newer, the HOAs are more prevelant and the amount of rental units goes down. Each era has left it's mark, but the sprawl continues. I'm willing to be that in another 10 years, Argyle Forest Blvd will be another 10 miles longer with another shopping center at the end.