Not necessarily, as it is ultimately about profits. Restaurants are a thin-margin business, so an additional $1,000,000 in revenue might translate to $50,000 in profit, if they are successful. Even the fast food restaurants are starting to run into trouble in passing along higher costs now. I know what you mean with the business decision vs real estate decision conundrum, though.
Not sure about other appraisers here, but I'm starting to see some very early cracks in the foundation. Maybe it is just in my area, but the industrial market is softening a bit, restaurant closures are accelerating. Values still seem to be holding up, but that seems to only be due to the low supply of available listings.