So what was the plan for remain? Remain also had no plan.
What kind of plan do you need to maintain the status quo?
A plan to align, to surrender more powers, laws, money, control. A plan to surrender national democracy in favour of federalism. Maybe the people should be consulted. You see the Lisbon Treaty was never put to the people of the the UK and the referendum result was partially a backlash.
So now you are saying there were an extensive series of well established plans already in motion -- that's quite an about face from "no plan".
Why should the people be consulted about international treaties in a constitutional monarchy?
In England's form of government, the people's role is to elect members of the House of Commons, who then act on their behalf.
The people have no legally binding voice, beyond their elected representative.
Similarly, the referendum to leave the European Union, was a legally non-binding referendum, and I would dare to say that Cameron regrets consulting the people on that particular point.