I think the 5.0+ will be standard after this year. When more people hold these things in public, eventually it will not be so weird. Then everyone will start getting these larger phones. The longer battery life will another incentive when the masses realize it.
It will always be weird to be carrying such a large thing for luxury. It's the movie Idiocracy happening already. "In the earliest part of the 21st century people were consumed with having the largest phone, celebrity culture, and some idiot named Beyoncé"
There will be skits of 10" phones soon making rounds on the comedy circuits.