How is it possible that Bitcoin is a stepping stone, when the code is open source and can change? It's not stuck and frozen in time, it can evolve, right?
However Bitcoins code is hardwired to only
25 21 million coins that's it.
Are you sure?
I heard the CEO of bitcoin just increased it to 21 trillion "bits" and that presently there are about 12.8 trillion bits in circulation

. Considering US M2 money supply is currently about 11.2 trillion dollars, if each bit was worth about one dollar, there should be enough units to support even a major global currency.