If the Alternative Vote system is rejected in May’s referendum, it could mean greater unity for the coalition, rather than the predicted schism.
In assessing the future unity  of the coalition, much of the focus has been on how the Lib Dems in particular would react to the big political events of the parliamentary term so far: the Strategic Defence Review, the Spending Review, Lord Browne's review of higher education funding, and next May's referendum on voting reform.
The assumption has been that, if under pressure from party grass roots and sour public opinion – over their previous pledge not to raise university tuition fees , for instance – in the face of reversed coalition policy, at least some Lib Dems could rebel, or even walk away from the coalition altogether.
The Alternative Vote referendum, expected to take place in May along with proposed changes to constituency boundaries , was reportedly the price Nick Clegg asked for his party's membership of the coalition, back in May.
It is an issue of paramount importance to the party at all levels, thus a "No" result would be a great blow to Lib Dems in government, prompting speculation  and, in turn, denials that the party would "walk away" from the coalition if the public rejected AV. If the Tories do indeed actively campaign against reform, it would undoubtedly be a problematic situation.
But Nick Boles, the Conservative MP for Grantham and Stamford, who made a small splash  a while back by writing a book calling for an electoral pact between the Tories and the Lib Dems in 2015, has now suggested in an interview that a "Yes" on AV would make the Lib Dems more likely to walk away from the coalition, while a "No" would leave them with no choice other than to stay the course. Boles said , in an interview with the website Yoosk:
If they were to win the referendum and AV were to be brought in, you could imagine a lot of Liberal Democrats saying, "Right, we got what we came for, now we'll withdraw from the coalition and make ourselves an independent voice again on the presumption that in a future election we'll do better than under first-past-the-post." So actually, if anything, they're more likely to leave if they win the referendum. If they lose the referendum, the only thing left to them is the persuade the British people that coalitions are a good thing, and to do that they have to stick with it until 2015.
This point was also made back in July by Peter Oborne (highlighted here  by my colleague Jon Bernstein). Given that the Lib Dems seem, so far, to be holding on despite the storm surrounding tuition fees and spending cuts, commentators, including Boles, are agreed that the referendum will be a watershed for the coalition.
Whether a "Yes" on AV will prompt the Lib Dems to take their chances as an independent party remains to be seen. However, it is worth noting that, according to the Guardian's arithmetic  at the time, had the last election been conducted under AV, the Lib Dems could have expected a further 20 seats only.
Whatever happens in May, they aren't out of coalition territory just yet.