Sure but let's look at all the failed industries since then. Pretty much all manufacturing ha left the country. We are down to three auto manufacturers. Appliances for the most part gone.
The efficiency of the fast food industry is due to on time delivery and mass purchasing power. Prices have also risen along with wages. We love our fast foods so the demand works to the favor of business but the expected bounce during this recession as historically expected has not occurred. Next prices will bounce again.