So long as this new system accepts that this is a cost of doing business and implements a customer service policy where the risk is spread among all retail participants, this would be competitive with the status quo.
These merchants aren't going to get out of paying fees, but they should be able to reduce those fees to the cost of providing a competitive service to the credit cards. The benefit is that they won't have to also pay higher fees than necessary to get the benefit of the system.
If they provide this basic safety feature, than upgrading security will be a given since it will reduce a major cost on their balance sheet, which is dealing with fraudulent transactions.