That's my basic question. He doesn't think it is worth applying because no one will negotiate start date while I try and convince him that everything is negotiable.
Well, some things are negotiable, some things are not, but you'll never know which it is until you get a chance to negotiate. (I'm full of little aphorisms like that -- another favorite is "You can't turn down a job you haven't been offered.")
Even if your husband was unquestionably a strong TT candidate, he could easily be on the job market for several years before finding a suitable position. It might be that the only position that he will be offered is available this year. Or it might be that it's coming up three years from now. There's no way to know. But I do know he won't get that job if he doesn't apply for it.
(See? Told you I'm loaded with these pithy little things.)