Las Vegas seems like a challenging environment to make it work, but I think he's definitely on to something. I think this is why the technology scene in California pivoted to San Francisco. It's also what makes NYC promising. Seems most people would prefer to work in am urban core rather than in an office park.
I think it would be interesting to see corporate campuses follow dense residential trends and create multi-use buildings with the ground floor dedicated to publicly accessible restaurants, retail, etc. That would even help fund the project.