bitcoin is growing , people gets interested more and more everyday
why not bitcoin can be worldwide coin
Because not all of the people in the world can afford such coin, and, they are not tech savvy, they are just contented on what they have, and if you want to make these digital currency global, you need to wait for the bitcoin to be scaled.
If you will generalize people in the world then you can realize that you are wrong because cryptocurrencies doesn't require too much money to be part of it because you can buy even you have at least $10 from your pocket then you can buy bitcoin or any kind of cryptocurrencies with that. Don't think too much because cryptocurrencies is for everyone.