Even though I am not a member of UKIP, I agree with many of their policies, particularly on Climate Change, where the excellent Roger Helmer, MEP (a former Conservative) has drawn up a sensible policy on energy. A snap election could see many voters, particularly Labour ones, decide that UKIP's immigration policy is much more to their liking than the 'open doors' policy of the current Labour party. If that happens it would be seismic here in the UK.
Maybe there won't be a snap election. The new Conservative leader may get cold feet like Gordon Brown did when he inherited the leadership from Tony Blair. Brown lived to regret his decision, as the polls went against him and he never recovered, losing the 2010 election to David Cameron. The new Conservative leader may calculate that he need not bother as Labour will still be unelectable in 2020, when the next UK election is due.