Lolno.
Minecraft's quality can do nothing but go up (trust me, it has alot of room to)
How would you implement a hat system in minecraft?
-Better yet, who would want minecraft to become another TF2?
I think if they added like 100 collectible hats in it that would spawn in random chests though out the world and the hats were permanent avatar items, I'd play minecraft all the time.
As it stands, there's just nothing to do in the game besides build.