This really depends on what field the product is in. In my opinion; if you can't sell it you could also try to hand it over to another company / third party. F

This really depends on what field the product is in. In my opinion; if you can't sell it you could also try to hand it over to another company / third party. Finding someone to take over a project takes a bit of time but it'd allow for it to survive. However you need legal advice, fast. First talk to a lawyer who understands this.