Like other commenters, also wondering how his elaborate business plans (made w/ experienced restaurateur's input) could be so wildly inaccurate.
Maybe another lesson is, don't rush to the "hot spot." Maybe find a market that has no good scene instead. Be an early gentrifier. By the time newspapers are writing about "hot spots" "hot jobs" etc, it's almost always the high-water mark.
Multiple times I've spotted tops of commodity bubbles by noticing when news articles talk about the absurd wages being paid the labor force. Miners and crane-operators being paid $250k/year during the initial Western Australia mining boom. Low-level labor in North Dakota being paid crazily during the initial part of the Shale Boom, etc. The news coverage is always breathless and euphoric. Wonder if we could build some sentiment analysis that can detect these sorts of articles in a generalized way?
Another way I've heard it described, "whatever industry the current class of graduating MBA is racing to join--avoid it."