My wife and I had to deal with that situation somewhat. But that was within southern germany and there's no shortage of jobs for most people. So my wife found something quite quick. Also we had friends at our new location. It can / will be hard to get a grasp without some people you know. Imho it really helps if you got some people in reach, not necessary every day but maybe to see at the weekend and talk to.
I somewhat agree with AsParalell about the not moving. But in my case it wouldn't have been a problem to find a new job quickly. Don't know about the situation in France. On the other hand it could also be negative when you're there without your wife and can't commit fully to your job.
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