True. VISA/MC will eventually do something to protect their hegemony, but what can they do? Lower fees to $0? I think their days are numbered (good riddance).
They will lobby to implement more regulations with regards to "money transmitters" in the hopes of increasing their costs enough that they have to raise fees.
See: http://www.quora.com/Aaron-Greenspan/Posts/In-Fifty-Days-Pay...
I hope Dwolla never sells for this reason.