What makes you think the merchant ecosystem doesn't work? In fact we have actually developed a proof of concept with a number of partners and they actually work. Just need a few more touches to it.
I'm sure it will work, technically speaking. But the adoption rate is going to be a big challenge. Unless every merchant is using it, nobody will want to use it. There are just too many other crypto payment solutions vying for attention... Just start simple and sell the biometric hardware wallet for $ :p