Per capita metrics are useless when it comes to climate stats. The ice caps don't care about how much hydrocarbons are burned per person, they are only affected by the net amount of hydrocarbons burned on a global scale.
And if per capita consumption can go down in the 2010's when we had negligible amounts of wind, solar, EV's and heat pumps, what'll it do in the 2020's when we have non-negligible amounts of wind, solar, EV's and heat pumps?