Many people should consider that the existing Federal Reserve Note may not exist in the future.

This is true - digital currencies are coming, but what does it change in regard to who controls it, other than giving more control to them? At some point, it will be circumvented regardless I think.

Full adoption is the goal, but for a while at least, a side by side system will exist. What is going to be interesting is when people demand all businesses and governments perform and record on transparent blockchains.