When you vote to close on SO for being off topic, there is a migration dialog that appears. I feel one should be available here to migrate to SO (and potentially others, the extent of which I leave open for debate.) We had one just now that was a programming question. With how often, all across the internet, things are posted again and again in the wrong spot, I feel we're going to get a lot of use out of this feature.
For now, I simply flagged it, as I believe global moderators/employees have the ability to migrate at will.