The number of people who use true p2p exchanges or buy BTC f2f is far smaller than those who buy in centralized exchanges, people will always prefer the 'convenient' option, even if it is the less secure one.
Admit it or not people are still a little bit hesitant of going all free. Freedom and independence are concepts that are not normally and easily given to people so we all crave for some governing body to lead us and tell us that everything is safe and secure.
Finally the time where we all able to let of all restrictions and trust ourselves we will be able to embrace crypto wholly.