What gives you the greatest pause when imagining a world with a large majority of people sharing your basic personality? And, how would the world be a better place given that same scenario?
With a large majority of Pats in the world, the competition for air time could be brutal. Because even though I'm not an off-the-charts extrovert, my need for attention is pretty uniformly high. And when I'm not mindful, that extrovert/attention seeking combo really contributes to the ambient noise of the world.
On the flip side, compassion would not be in short supply. With Pats all around, not as many reminders about walking in the shoes of others might be needed.