Response to McCracken
Obviously I disagree with much of what you posted. I'll just pick the one I know the most about, though; this peculiar idea that it's better to put large retail destinations on "highways" rather than at the intersection of two city arterial roadways, next to a major transit center. Only in Texas (where frontage roads are viewed as the normal state of affairs rather than an occasional last-ditch tool to provide access when all else fails) would we even be having this conversation; note that the new Wal-Mart in Atlanta being compared to this one is _NOT_, I repeat, _NOT_ "on the highway".
I refer readers again to my (artlessly drawn but hopefully at least readable) diagram linked to if you click on "M1EK" at the end of this posting. It's simply impossible to deliver high-quality transit service on highway frontage roads -- but it's very easy to do so on arterial roadways. All you need to do is take a look at those #3 buses going up and down Burnet Road vs. the #383 buses going up and down Research Blvd. if you don't believe me - both are operating in relatively the same density development; but one is a success and one is a failure.
Frontage roads also destroy the ability to travel by foot (for nearby pedestrians) and severely hamper travel by bicycle; but in this case, transit is probably the most important mode to worry about. Remember, though, that when dealing with frontage road development, we also have to somehow convince TXDOT to build sidewalks along the frontage road in the best-case scenario (and, of course, they've designed some 'highways' in ways that make even the provision of such sidewalks by the City of Austin impossible - US 183 near Braker Lane, for instance; in this photo-essay: http://www.io.com/~mdahmus/183sidewalks/183sidewalks.html
Pushing all our big boxes (and other employers/destinations) to frontage roads simply means the people travelling there can't do so by any means other than the private automobile. This doesn't hurt high-tech office workers on US 183 as much as it does the potential employees of Wal-Mart, of course.
As for the remaining points - I'm happy the neighborhoods have learned to not make the strategic error that NUNA did vis-a-vis The Villas On Guadalupe. That's a far cry from evidence that they now support urban mixed-use development "like the Triangle". A Triangle-style development, expanded to cover the footprint of Northcross Mall, would be bringing in not only roughly the same amount of retail as this proposal, but thousands of units of multi-family; and the nearby neighborhoods have opposed previous efforts to increase multi-family in the area quite recently (hotel conversion at south edge of property).
Mike Dahmus (M1EK's Bake-Sale of Bile)
Urban Transportation Commission 2001-2005