If cryptocurrency succeeds as a major financial innovation, bitcoin won't be the only one. In fact, some altcoins with superior features could take over most of the cryptocurrency market in as soon as a year or two. Things move fast, and we're still in the early phases of the rise of cryptocurrency. Ordinary people probably still have plenty of time to get into these investments and grow their wealth.
Ordinary people in the 3rd world? If cryptocurrencies are dependent on technological innovation, the people that are behind, are only going to be left further behind.
Yes, sadly the people who are being left behind in the 21st century economy will likely fall further and further behind. It's not because of bitcoin, it's because of automation, robotics and AI replacing the need for most human labor.
If you care about someone, plead with them to buy these rapidly growing store-of-value assets such as cryptocurrencies. Many people are going to have to live off of their investments when most jobs will be eliminated in the next few decades. Cryptocurrencies may in fact be the last chance for middle class people to gain enough wealth so that they can survive when automation really starts destroying the job market by making most jobs unnecessary.
Of course, what I'm describing could also cause a collapse of the current economic system. But who knows what would replace it. Things could get tragic for people with no savings or assets to fall back on, during a global depression.