The replacement blades Havalon uses look like long surgical blades. Super sharp I imagine but likely brittle compared to a normal knife blade. Xacto blades good for hobby work but would be horribly inadequate for cutting rope. I like my LM, SOG and Gerber blades the way they are. I'll stick to resharping my blades and using them intelligently.
Instead of surgical-like blades, I much rather to see a replaceable cutter blade in the Wave/Charge format. I think currently there a few replaceable cutter knife MT but they are all in a 'knife' format rather than a plier based MT. And it'd be nice to see a plier based MT equipped with an OHO interchangeable blade.