people around the world are not adopting bitcoin because of those thing in general
1- security
2- regulation
those two thing must be addressed in order to rise the adoption of bitcoin
the secuirty can be done by the exchage(so it's not even a bitcoin fault)
the regulation is on the way on some countries, but need to be speeded up and should be easy for average people, not something like "i need to take note of every transactions" or other things too laborious
Bitcoin is as secure as it gets, the problem is people it seems is too dumb to be their own banks ( the general public). Xapo is a good solution for this.
Regulation, it will happen and will being with the Winlevii ETF.