Dissolution and Calling of Parliament Bill

Is it equally the case that including this vote in the Bill would not mitigate people not being good chaps? If a Prime Minister has a majority and they could get that vote through—who knows what their reasons are—when they see things coming over the horizon that might give them some advantage, it makes it difficult for the monarch to say “no” under the Bill. Is it better to preserve what was best about our constitution before 2010, which relies on the Prime Minister and the monarch being responsible, and the good behaviour that should follow?