I don't like and disagree with your idea. Perhaps in the future scientists will work out a better solution now as technology evolves. But in the next few years I hope that bitcoin will be the most popular payment method in the world.
That is right I can't see anything else too that would fit the future that is why for me I am considering that cryptocurrency are the future of everything that is why we need to make ourselves ready for this as this will fit our future, so at least now we should be confident enough for it.