That's a tough one. Please keep trying to find a home for it first. But then the person you give it to might turn it into a tractor too. If you have to junk it, strip the usable parts like the bobbin winder off first. Someone will need one somewhere.
Supply does outmatch demand at the moment but as with all other antiques that will change in time. These old straight stitchers might only do one thing but they do it very well. Better than many new machines are capable of and in thicker material.
Rodney