Are you already where you want to be, geographically? One of our limitations is that our kids are old enough that we don't want to relocate until they finish school, so that has us staying where we are for 5+ years. If we had been in the same position 10 years ago, they would have been young enough that we would have been willing to do an international move if we could work out the details. Learning a new language would be rough for them at this point of their education.

Ideally (for me), we would leave as soon as they graduate (or close to it) and they would come with us, then they could take a break to learn the language before going to college.