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.
The fact that they have not big names in their squad compared to the others and their inconsistency in the football they have shown so far.Arsenal for example have shown a much better football this season compared to Leicester and is just a matter of time for them to become more consistent in results.I think at least Arsenal will be ahead of Leicester in the end of the Premier League.