The prospect of change may well have been rejected in 2011 but I am reading some new figures which estimate that in this general election, under the current UK FPTP system, the average MP could be elected with less than 46% of the votes cast. (Edinburgh West could well be won with just 25% of the votes on current predictions.)
This can not be good for democracy and I have noticed even people on this board questioning whether they'll bother to vote at all under the current system. I'm sure that voter apathy with voter turnout below 70% since 2001 could well be a result of some people thinking that their vote simply could not count.
I can't see how any party could credibly reject a change although they may well wish to argue on the shape that any change might take.