I can only see this going into a very dystopian path. Based on their actions, I don't trust these companies, their security practices, nor their privacy policies. Why would I give them my biometrics? And my full palm, at that!? Hell no!
I just don't subscribe to the slippery slope arguments I am provided when it comes to privacy. I and I suspect most other people just prefer convenience to some hypothetical threat to what I am not sure.