Would it be a good idea to change the migration destination sites based on the question tags?
The new migrate option allows one to select from a limited number of destination sites. This group of sites is the same for a whole site, to keep the list short. However, if a question is tagged with wordpress, it is likely that the WordPress SE site would be a good destination.
What do you think of extending the destination list based on question tags? This would give smaller SE sites a chance of migration input, without polluting the list for all questions. So you still have three or four standard destinations, and then add tag-based destinations to the list.