Idea about size

So I have this idea that we, as a people, are getting too big. Not fat, just big. Everyone loves tall people. I think we are going the wrong way. If we tried to get people to evolve smaller, think of the resources we could save! If we got people to be about two foot six, we could put an extra floor in every room and double the square footage of every house! Our cars could be half the size and automatically our four lane highways become eight lanes! Genius, right? I know.