I disagree. This will be one of Silicon Valley's missed opportunities. Anyone who unlocks the potential of those users and of developing economies has the potential to create immense value.
By the way, my point is not that they will contribute to crypto, but rather that their integration into the Internet ecosystem will require new technologies, new platforms, and new solutions to social problems so far divorced from what SV is used to dealing with... that there will be a market and a need for platforms and technology in those regions/demographics. To ignore that is to ignore billions, potentially trillions, of dollars of value.