Visa + Amex + Mastercard will compete against Paypal

Won't happen. You'll still need to enter your credit card details to pay via those, one button or more buttons, same difference. The inherent issue stays. Many people still don't feel safe entering those details for a good reason.

If everyone could have a secondary virtual card, which could be loaded from the primary physical card, paying with credit card online would be a lot safer. Some banks offer this. If shit happens, you only lost a smaller amount on your secondary card, carders can't touch the balance of the primary card.