Note that this does not effect all MIPS-based systems. The standard has included hardware floating point for many years now, it just seems some OEMs have neglected to upgrade or cut it for cost savings.
Consumers don't really care about speed, they care about checkboxes being checked. I'd be surprised if dual core really did anything for getting packets to and from the gateway interface any quicker. If anything I bet it makes it go slower with a naive implementation.
They aren't hacked yet when they make decision about buying the router, and anyway they cannot differentiate based on security promises marketed to them by vendors.