I think that in the long run they cant keep up with the pressure the Premier League puts the teams in and may even finish lower than the 4th place in the end.
I'm surprised by people underestimating Leicester. Compared to Chelsea, Arsenal or United, Leicester are no doubt a better team so far. What makes you think they'll fall behind the other big 4? Because they don't have a 30-60 million players?
Other than City and Liverpool, I think Leicester is playing really good football so far.