$0 x N is still $0, and the difference between 1 EV certificate and 3 EV certificates is not going to put anybody who really thinks they need one out of business.

> And I don't think that would be something that you could get the various providers to even agree on.

Put simply, certificate authorities don't have a vote. It's up to the browser and OS vendors to set their own requirements for default trust.

If Google, Microsoft, Mozilla, and Apple declare that all SSL certificates lacking at least N valid signatures are treated by default as invalid, that's the ball game. If the current authorities don't play along, new authorities will.

Edit: I should also note that there's really no need for anybody to play along. You can ship a CSR off to as many authorities as you want for signatures, then assemble those signatures and your certificate in whatever form is used by your server and the browsers. The only possible response by an authority is revocation of their signature upon discovery that your certificate has been signed by other authorities, too. Such an action would make them a laughingstock.