There doesn't seem to be any break in the duopoly. Even though people dislike the Tories, they still aim to vote for them in the next election as they dislike them less than Labour, and FPTP makes it unlikely that their vote will make any difference in voting in another party. So it goes back and forth between two parties that have been discredited many times before.
We all hate Labour now, but just wait until the Conservatives run out of ideas and become unpopular (and it will happen, probably sooner than most people think), will they just go back to Labour again?