So my guess is that Miliband will cling on, and for the avoidance of doubt, that's something we should warmly welcome. If Johann Lamont was a liability for Scottish Labour, Miliband is a liability-on-steroids - today's YouGov poll shows that people IN SCOTLAND prefer Cameron to Miliband by a margin of 31% to 15%.
But just supposing he does go. One thing that has become clear over the last couple of weeks is that "Jackanory Jim" Murphy himself, Murphy's Tory-funded disciples such as Blair McDougall and Rob "I still have a mortgage to pay" Shorthouse, and Murphy's awestruck groupies in the media, see the current frontrunner for the Scottish Labour "leadership" as a Messiah-type figure who would be running for President of the United States if only he hadn't been born in the wrong continent. So surely if a vacancy in the UK party leadership did occur, the only possible conclusion to draw is that Murphy would have a duty to forget about the piffling affairs of Scotland, and to "save" London Labour instead? That would throw the Scottish leadership contest into absolute chaos.
It might be as well to have some "standby popcorn" to hand - you know, just in case.