We desperately need to break Visa's stranglehold on access to the consumer side of commerce. As long as everyone's only innovating and competing on the merchant side of things, we're not really going to get anywhere.
Are you prepared to protect customers by refunding them if they are victims of fraud when using your payment system? Visa and MasterCard are prepared to do that. That's how they could convince consumers to use their cards without worrying.
You're free to make your own card network. How will you convince banks to issue your cards and merchants to accept them?