Do you think we all should have a plan for life?

I think the real answer and what maybe the film points to, is Balance. Planning your life is fine and has many positives, however the best made plans have problems and unforeseen cirstances, so taking a bit of a risk now an then will inject some excitement while also allowing for misfortune etc. You don't need a planned life - perhaps what would be nice would be having a life goal to work towards without having a plan as to how to reach it.