It's extremely unlikely that any TV 'debate' will now take place. Even if you thought the 7-way stretch was feasible within the timescale dictated by Cameron (or, to be more accurate, Lynton Crosby and Oliver Letwin) the Democratic Unionists will put a spoke in the wheel if they can, and Gorgeous George, the most litigious politician of his generation, has already said he will too if he is not invited and not all of his threats are idle ones.
The 'empty chair' scenario postured by some will not happen: the BBC for one would be s***scared of perceived political bias, particularly before an election and knowing some Conservative politicians' loathing of the organisation.
The great intellectual wheeze of having this 'debate' before the party manifestoes are out is another nonsense, as is the notion that it (or they) should be held before the electioneering really gets under way, although the sceptical nay cynical among us might say that's being going on for at least a year now thanks to that wretched undemocratic fixed-term parliament gerrymandering.
All it actually says is Cameron has nothing to gain, and possibly a bit to lose, by taking part but is too scared of the bad PR by vetoing it so Grant Shapps (anyone got a nice anagram for that name?) has been sent out to handle the flak and, on 'Daily Politics' yesterday with Andrew Neil, to be publically eviscerated. I almost felt sorry for a Tory! He'd have gone back to Central Office with his tail between his legs if Neil hadn't already bitten it off.