How long have they had this snake, by the way? (How long has it been "since day 1"?)
Are there kids in the household? When they admitted that maybe their household is just too much for this snake, that is sort of a hint, IMO. Overhandling by clueless kids is a huge reason why many snakes stop eating, as is too many dogs & cats running around. Stress is way more fixable than some unknown disease, so maybe ask more questions while you're deciding.
And plenty of snakes won't eat Repti-links.What else did they try?
Whatever you decide, none of us has a 'crystal ball' & the decision is yours alone to live with. I won't blame you whatever you decide. (I likes it up here on this fence...hahaha!)