This may just be me being idiosyncratic with vocabulary. To me, "less viable" implies there some outside factor or internal failure preventing it from working.

This may just be me being idiosyncratic with vocabulary. To me, "less viable" implies there some outside factor or internal failure preventing it from working. But non-internet appliances will continue to work just fine, if you can get one. I.e. it's a viable choice, just one with less and less availability.