Moving abroad is the best option specially to those who cant find a job in their own country, ot to those who has a job but very small salary, we all wanted to have a bright future but sometimes future depends on our luck, because there are also people who go abroad but still cannot find enough money to have a bright future.
Everyone has a different way of believing they will be successful the way they are. You are right that going abroad can also increase your income but it cannot be said that you will be successful abroad. There are people who are successful in their own country and all have their own path to reach their dreams.