i think it bitcoin can be good payment system and payment gateway.there is no need third party to transfer your money.its peer to peer and safe.so it grow good payment system.
I dont agree with this if you are talking about a massive usage of Bitcojn as a medium of payment to the community, it can be possible to cashless society which is proven to be a thing that will make our community worse than before. I dont agree with his in the sense that most of the yransaction might be dependent on Bitcoin.