Sorry: it's a long one, I'm trying to avoid drip feeding!
DH is an assistant head in a school. He's been there about 12 years and has been promoted, but now there is unlikely to be any further challenge or promotion. He often complains that he's bored or that other people are asking him to do a lot of things that, really, they should be doing.
Anyway, a job has come along that he could apply for. It would be a promotion and would offer opportunities to him that he won't get at the moment. He has lots of the experience required and has several strengths which the school asks for. As it would be in an independent school DS could attend it (rather than our local Requires Improvement secondary) and there would be lots of things that DS would enjoy and get a lot if benefit from.
We would need to move, but to an area we know well. DS is in yr6 so it would be as good a time as any to go. I'd need to find a new job, but could do supply teaching in the meantime.
However, after deciding he would apply and us sorting out practicalities, DH now seems to be getting cold feet. Last night he told me he didn't think I'd leave my volunteering role (I would, I'm sure I can do the same thing in the new area) and he didn't want the worry of me driving for 2 hours each week to get there. 
He has done this a few times- hot me planning the idea of a move, looking into practical stuff (dreaming of new adventure) only to back out at the last minute. Then complaining about current job.
AIBU to want him to follow through with this- so many good things could come from it- only 15 more years of the same thing will come from staying here.