We could still have a form of currency (bitcoins!) but it would be a sound source, not one that could be printed out of thin air.
My thoughts on money, currency and bartering are that it is an outdated method of controlling power and influence. We (humans) are at a threshold of industry and invention that makes our current value system unuseable. The projects and exploration we are about to embark upon would cost billions if not trillions of dollars. So instead of moving forward into a Type 1 civilization we mess around debating the cost effectiveness and do nothing because of the cost prohibitiveness.
Why must there be a need to assign a value to something if it is to serve all mankind? Greed has a lot to do with it. But if you think about it. If everything were free, I mean really free, what advances would we make in science, arts, humanities, health? Yes, some people would try to be lazy. Not do their part but I believe most everyone would keep busy doing the things they enjoy. It might be more realistic than we would like to admit. I'm not refering to Communism where the powers that be control everything. I am thinking more of an individualism, where each person contributes and shares in the advances all over the world.
Humans used to hunt and gather/forage for food. Money came along and people right beside one another can now starve to death. Money is stagnating our ability to grow as a species. It's outdated and restrictive.
I also know we could not go from our present system to a totally free economy. It would need to be done in segments. Like the stuff needed for life should come first. Then, perhaps utilities. All the while having the cost of other items go down at a steady rate.
I guess I should start a topic to delve deeper into this. Might be worthy of a discussion.
Let me think on it or one of you can take the reigns on a topic. I will participate...