Would you still use and believe in bitcoin if it became reversible, say if satoshi himself managed the disputes like paypal does?
Will you quit?
As most of others said it's impossible. Satoshi manages disputes? I laughed at that part. Reversible payments are one of the most important specifications in Bitcoin. You get money from other side of the world, you don't want to get disputed. Plus nobody can deny or reverse these payments, Bitcoin is not a corporation.