No offense but I think this statement shows exactly what makes Stripe so non-disruptive. Stripe has targeted a niche, not a vertical. Payment processing exists beyond the needs of new web ventures. The majority of businesses (brick and mortars) can't even make use of stripe without a VAR or OEM acting as a middle man, and at that point where is the value that stripe brings to the table? The savings will be eaten up by the middle man.
Stripe may be great for a small development shop cranking out mobile and web apps (I'm their target market, I'm considering using it for my SaaS myself) but once a business starts to scale saving a quarter or half percentage point on processing fees by using something like auth.net makes sense when weighed against the usability of stripe from a developer perspective.