A big factor has been the removal of the dominant behemoth of Sir Alex Ferguson's Manchester United. They were either champions or runners-up in 18 out of the 21 Prem seasons he was in charge (came 3rd in the other three).
Also Chelsea and Wenger's Arsenal have staggered. If Guardiola and Conte have a hard time adjusting to English football, and Wenger continues to struggle, the opening will still be there.
With all the ridiculous questions sky presenters ask to try and tease out a negative reaction, I thought Mauricio Pochettino was a total gentleman in the post match interview. So pleased for Leicester, but feel quite sorry for Spurs as they've played some awesome football this year.