The conversation you two are having is a good one, and discussed a lot on this board: how to balance responsible long-term planning while still living one's dreams. If you weren't married you'd likely still have to have the same dialogue, except you'd have to do both parts on your own. It's more fun with two.
The only thing I'd like to add is that your husband's plans may not be all that confining, possibly you don't need to voice his desire to do some long range thinking as the "High risk of settling down unless inspired". Specifically in terms of home ownership- while the housing market is still a little dicey, my guess is that for most of N. America it's not going to slide much further (though I wouldn't expect a rebound). Though gawkabout is correct, in his usual stream of consciousness style, to warn against placing too much meaning on ownership, on the other hand the financial risk of buying a home probably isn't great. So you own a home, this doesn't mean that you can't leave. Many of the expats I know own homes, which they either leave empty (if they can afford it) or rent out (our case). Though gawkabout is right that attachment to things can be a trap, there nonetheless seems to be a basic human desire to know where 'home' is, and for many a house can be a powerful and important symbol of that.
Planning for the future is not the end of adventures. In the case of our family we didn't leave the country until my wife and I were older than either of you, with home, jobs, and children all in the package. We still have the home (haven't seen it in a while, admittedly), still have the same job (thanks be to the internets), and still have the children (who are now fluently bilingual).
In fact, I'd suggest that a real risk you face is in leaving what you've build up together when you aren't inspired. That is, you've voiced a desire to do something with your life, but no ambition in particular appears to be pulling you abroad. Another sentiment sometimes expressed on this board is that travelling and living abroad are not the same. Work is, frankly, work, wherever it may be. At least in my experience, a work day in China is not really all that different from a work day in the US. Get up, wash, go to the office, etc. There are still electricity bills to pay, groceries to buy, always at least one crazy neighbor, etc. You know, normal life.
I posted here once how surprised I was as to how little of my life changed upon moving to China. Yes, different language, different culture, food is better, etc. But inside I'm mostly the same, and that's really what governs how we see our life. Of course this isn't to say that there is no point in moving abroad. But if one's hope is that moving abroad will fill some nameless void in their life- they might find that the void is still there, no matter how far they travel.
Therefore if I have any advice it would be to not give up any of your dreams, but giving up anxiety about those dreams. If your husband wants to do some long range planning,... well, someday you may be glad he did. Or maybe in a few years you'll figure out what you both really need to do, and at that time you'll rent out the house and go off together to Paris, or wherever. Purpletreefrog's advice of travelling together to find your shared likes is good. Maybe even better, if you can swing it, is to try living abroad, even if only for a few months of renting a small cheap place in SE Asia. You might succeed in luring your husband to the dark side, or you may find that having a home to return to is really nice.
Good luck!
