bitcoin is a future digital currency, i strongly believes that before BTC celebrate 50 years in existence at least one or two African countries is going to legalis it. because block chain network is expanding every day by day. and most of the countries in Africa have the knowledge BTC how it works.
I don't want to look forward for that long. 5-10 years is fine of wait and anticipation but thinking of 50 years and even for the last bitcoin to get mined is out of my radar. I don't know if we'll still be existing by that time and there will be more changes to economics and financial industry by that time. So, it's just best to focus on the current time and a little few years in the future but if that's what you think that it should get prepared for then good luck. You have no control over that long to the world and global changes.