C) Current financial giants will have swallowed up much of cryptospace. CBDC will be a real thing, so why bother with other cryptos? Some may be large enough to remain as new players - just as some medieval banks had to give way to newer banks in 18th C.

What central banks really hate is giving up their privileged position and the special relationship with their fave bankers. Fractional reserve banking may be a thing of the past as it is not easy to encode without erecting barriers. Something the ECB is considering is how an individual can have direct access to central bank. They don't like that as it levels the playing field. Defi look like experiments in leveraging - which is what FR banking is.

Cryptoeconomic systems such as steem may end up proliferating and serving as yield farms or bond issues. Actual economic systems may fade away due to lack of numbers.