Mainstream usage of cryptocurrency will be enabled primarily by direct party-to-party contract negotiation…with the use of the blockchain primarily as a dispute resolution mechanism. The block size isn’t about scaling but about supply and demand of finite resources. As demand for block space increases, we can address it either by increasing computational resources (block size) or by increasing fees. But to do the former we need a way to offset the increase in cost by making sure that those who contribute said resources have incentive to do so.