Ethereum doesn't use PoS. We're not discussing science fiction or hypothetical scenarios, here. We are discussing the reality of crypto-currencies vis-a-vis the banking industry.
As I mentioned, when you remove trade barriers, such as the EU did, the cost of international transactions falls to zero. This is because 1) the technology that banks use to transfer money is efficient, and 2) competition drives prices down to the average cost per transactions (which is near zero, thanks to 1). Now, in the crypto-currency industry you do have competition among crypto-currency transmitters, but you don't have an efficient technology to transfer crypto-currencies, instead you have a technology that performs horrendously in terms of cost-effectiveness, so transacting in crypto-currencies will always be more expensive than using banks. If this is the case, why do international transactions sometimes cost more if you use a bank? I already explained, it's because governments require banks to perform a series of checks therefore incurring additional costs that they pass on to customers. Transmitters of crypto-currencies don't perform these checks, and therefore they don't incur these extra costs, but of course this results in transactions that are not compliant with financial laws and regulations, and so the end-user will likely have to spend additional money laundering the funds and evading law enforcement. If you say that you can prove me wrong (this is what 'provably' means), then prove me wrong.
There is no science fiction about PoS, the transition is well under way and it is a matter of a few months.
> when you remove trade barriers, such as the EU did, the cost of international transactions falls to zero.
See, the whole point of crypto is that it gives us a globally interconnected trade network. If I just want to send money to someone in the EU, then of course I will just use SEPA. But SEPA means absolutely jack shit for someone trying to merely send money to a place where these basic freedoms are not granted.
Why should people should put up with the artificial barriers, when there is a parallel network that can work better for them? Do you think they can just be waiting until the powers-that-be at their local sphere to reach enlightenment and remove the barriers? I think it is a lot more efficient if we continue to work on a competing alternative for the people, at the very least to keep the goverments in check.
As I mentioned, when you remove trade barriers, such as the EU did, the cost of international transactions falls to zero. This is because 1) the technology that banks use to transfer money is efficient, and 2) competition drives prices down to the average cost per transactions (which is near zero, thanks to 1). Now, in the crypto-currency industry you do have competition among crypto-currency transmitters, but you don't have an efficient technology to transfer crypto-currencies, instead you have a technology that performs horrendously in terms of cost-effectiveness, so transacting in crypto-currencies will always be more expensive than using banks. If this is the case, why do international transactions sometimes cost more if you use a bank? I already explained, it's because governments require banks to perform a series of checks therefore incurring additional costs that they pass on to customers. Transmitters of crypto-currencies don't perform these checks, and therefore they don't incur these extra costs, but of course this results in transactions that are not compliant with financial laws and regulations, and so the end-user will likely have to spend additional money laundering the funds and evading law enforcement. If you say that you can prove me wrong (this is what 'provably' means), then prove me wrong.