Many people, I'm afraid, can't see beyond the end of their noses. Either that or they are just a bit thick.
I'd very much like UKIP to get in but, unfortunately, our present voting system favours the two major parties. The Limp Dems were fortunate to form a minor part of the coalition this time but, apart from that, they haven't a chance.
I'm afraid, short of a sea change in the way people vote, the same will apply to UKIP. At the very least, though, they have already influenced how the party (parties) in power are working.
Similar things to UKIP have happened in the past, however. At the turn of the 20th century the Labour party came into being out of nothing and soon became one of the two major players. Perhaps UKIP might just repeat that event.