Just because the Bank of Montreal may support competition in the debit market doesn't mean they de-support Interac. I think Interac is very important, and they are demonstrating this in the costs and time that they have put into this endeavour over the past two years. You'll have to ask more details of them, but from an issuer standpoint I think it's very important to have Interac as a countervailing force with respect to their dealings going forward.
On June 16th, 2009. See this statement in context.