Presumably other restaurants are thriving? Are we sure this particular one just didn't have the right business model, like most attempted restaurants don't? The restaurant industry is notoriously competitive, and the customer is always right -- you've got to give them the food they want (not the food you think they should want) at the location they want at a price that's competitive.
As long as plenty of other restaurants are managing to pay their staff enough so that they'll commute... and it doesn't seem like restaurants are disappearing from SF... then isn't this just the case of a bad business plan, or product-market-mistmatch, for this one particular restaurant?