So this addresses a 'need' but that 'need' doesn't have a market. In fact, that shadow-market is merely a consequence of the failure other markets. The need for this service is completely dependent upon the failure of the local restaurant industry to properly manage its demand, which in turn is likely due to the failure of a real estate market to provide profitable space for restaurants.

If EITHER of these two markets are disrupted, your market evaporates. Considering how popular food blogs and food trucks are becoming, I would not bank on this.