In any case that's a dodgy extrapolation to the electorate as a whole. While 93% of people may not have voted UKIP, that figure is being skewed by all those people who did not vote at all. One could equally well say that well over 95% of people didn't bother to vote LibDem, or of order 90% not caring enough about the Conservatives to vote.
Come the election in 2015, it's entirely possible that the UKIP vote could be just as substantial, and even lead to seats. The massive gains UKIP made this week were from almost a standing start, after all.
The next two years gives UKIP a chance to show that it can be a party just as serious as any other -- or perhaps, crumble under scrutiny. Time only will tell, but certainly you would be foolhardy to write UKIP off.