There are several related meta questions like:
Recently there are been multiple questions asked on Travel that have been closed with a suggestion in the comments that the OP should ask the question on Expatriates. If someone feels strongly enough to suggest that, why isn't the question just getting migrated? Or at least, include in the comment that the OP can flag the question and request a moderator migrate it?
If not there already, could there be a customized close reason that would reflect this trend?
Edit/Update: I was reading the recent Meta SE post about graduation, site closure, etc. and realized that one issue could be the general discouragement of migrating questions to a site still in beta, which Expatriates is. The idea is that a question could be lost if the beta site ends up closing. However, the post clearly indicates that no current beta site is in danger of closing.