So what would be worse? 

Closing the shop on short notice because no one would take it over or having the place run into the ground slowly by some dispassionate relative who could give a rats A$$ about the customers, service, or product?
 
Close the place on a happy note and move on. 

If there's market for the product someone will fill the void with their own capital and sweat.  

Life is to short to be wasted on......