Agreed that generating token demand is one the main challenges. It's going to be very hard. After reaching a certain level of adoption, token value should become partly self-sustaining, and then newly minted tokens have value - this is how fiat currencies work (which have the benefit of being the only way to pay taxes, which we don't).
But how to get to that critical mass? We have several solution directions, and will probably need a combination of them to work. We'll elaborate this further in the draft whitepaper soon. One of the solution directions that could be key especially in the early stages is a social movement of people that buy (and start using) the token because they agree with the mission of the project and want it to succeed. Adopting GLO is one of the most direct ways for individuals to contribute to a pro-UBI cause. This will only ever be a fraction of the total demand, of course, but can be a solid base to help solve the cold start problem.