In order to have a referendum on Britain's continuing membership of the EU, dave first of all has to win the Election next May. The only other Party that has any chance of winning, Labour, have shown no enthusiasm for a referendum. Judging by Farage's media interviews over the last 48 hours, dave is in danger of losing even more votes to UKIP than he was before, making a Labour vote more likely.
So, in my opinion, which won't be popular of course here on AB, its a Yes to your last sentence Gromit. Another nail in daves coffin.