Thanks Prytania! My partner knows he can't get "early" retirement - I mean, he can't draw on his retirement until he's 55 -- and also wouldn't be contributing to it (nor would his employer) in the intervening years. Though we have a lot of equity in our home, we figure his leaving now, even if he he got a new job eventually (which we would want to do), would cost us $250,000 at least!
I don't think it's going to cost us quite that much, but mrspouse is coming to the US on sabbatical with me and won't be working for 8 months (plus will need to find a new job when he gets back) - so over one year our income will probably be reduced by about $50-60K. For us the issue is, can we live on what we have and would we prefer to be together, not how much we'll lose. I guess we're happy to spend that much to be together for that period of time.
You sound like over 5 years you'd lose the same amount, would it be worth that much per year to be with your partner?