Maybe, given that in the UK PMs don't stay in post long, maybe it's time to return more powers, more policy to Parliament. Maybe the PM should be more of an administrator managing the implementation of the wishes of our elected representatives. Less of what has become increasingly the case where PM determines policy and expects Parliament to rubber stamp his/her wishes.
And were that the case then maybe they'd last in post longer as when things don't go as public wants then it's their elected representatives to blame rather than one individual very very few actually got the opportunity to vote for (or against).