The only real problem I see with the idea is that any processor interface / API would have to have to be deemed compliant by not only government regulators but by card issuers. Entities that are at lest as progressive in their management as the big 2 you mentioned. I don't know the ins and outs of payment processing, but it does occur to me that it wouldn't take much for a Visa, Master Card, or Diners Club to trace a new processor, research it a bit and "have interfacing issues".
I'm just being a Negative Nancy. I like the idea of a processor that just takes my business even if they don't like me. Much the way I view my clients; do what you want, if you don't cuss directly at me for no reason we're good.
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