Leicester and Chelsea both have lost their form they were in first stage of PL. It is hard to say if they will be able to continue if they maintain the same from throughout in the remainder of PL.
I don't see Leicester City missing out on next seasons champions league, they may not be in the same form as they were in the beginning of the season, but they just need a couple more wins and also considering the fact that the teams below them are also erratic, they should make it.
Chelsea and spurs for me will compete for fourth place, I am not giving united any chance, they'll be playing Europa league football next season for me. Chelsea should be careful of Mourinho's Spurs, they look like they would be able to usurp Chelsea for the fourth position if their good form continues. Liverpool have all but won the league, so it's now more like a top four battle between the other top teams.