El Salvador has grown over time. As a result the poverty have decreased to less than 20% and the same was 39% in 2007. The extreme poverty have come down to 1.5% and the same was 22% in 2007. Based on this I don't find people used the airdrops out of poverty and waiting to receive another airdrop. It is the awareness that makes them spend and leave. Maybe some other advancement will help overcome the issue, in specific education, awareness and need of technology.
The poverty rate may decrease little by little, but still El Salvador is a poor country. The whole truth is that the population does not need bitcoin, they are not ready for this. Recently, a journalist flew to El Salvador to see how they are doing, where you can pay with bitcoin, but everything turned out to be very sad, the sellers say that almost no one asked them to make a payment with bitcoin, even tourists.