“I'd like to see a Rouse-like approach for the 21st century, rather than copying the copycats in the way we've seen so far”

Me too! Columbia seems as though it was well thought out with regard to its infrastructure (roads, walkability, village centers, schools, etc.), coupled with the different housing options that made this county more socioeconomically diverse. The different housing options blend well too… the only outer Columbia example I can think of is Waverly Woods. It would be nice if the remainder of the county (EC, Elkridge, etc) could be retrofitted similar to Columbia.