Abandoning your country just seems like a very cowardly and disloyal move to me.
If noone is willing to risk themselves for the greater good, then no progressive change is possible
In first sentence you condemned most successful countries of 20th century, built on emigration, Australia, Canada, USA, New Zealand. How should we put it "Countries of cowards"? Though countries of emigrants, they proved your second sentence wrong, as they seamed to be ones of most progressive in the world.
We should mentioned that no matter where we are, we always work for greater good, for society good, we never live alone.
I'm sure there are some people that would make even more constrictive argument than yours. Does it make us cowards and disloyal, if we "emigrate" from a village or city where we were born? Shouldn't we stay in a village where ancestral labor is?
Should we be loyal to the blind faith giving us place to live on earth?
Every country's people are reaping the fruits of their ancestors' labor, it is one's duty to continue the process.
On other hand, our ancestors ruined our countries as well on many occasions, leaving no benefits for future generations. They were disloyal too, forsaking religion of our ancestors for Christianity or Muslim, or cowardly leaving their ancestors' lands(because of foreign invasions from east), attacking people and taking their lands, creating new nation in the process. It's good to be faithful on many occasions, but it is also wise to see how the world works, and not to be led like sheep to the slaughterhouse.
I can understand if someone immigrates to avoid genocide or because they are trying to get wealth in a First World country which they can then use to help their homeland, but if you immigrate SOLELY to improve ONLY your life, that is selfish beyond belief.
It is rarely the case, because most of us live in families, the smallest group unit. Improving once life improves whole family life too. It is very natural process; offspring and their survival is what counts in nature. This is what is left, the part of your DNA, long after your are gone. After good few generations nobody will remember your name, your religion, your language and your way of life. Do you know your grand, grand, grand, grand mother? (to be precise all 16 of them
, and 16 ggggand fathers)
Summing it up, what emigrants are doing now, is exactly what your ancestors did, at least the once who introduced the biggest changes to your country/nation. They moved from place to place, they changed religion and culture, they lost and screwed up on many occasions too. Even if you feel a proud Bosnian, you are a descendant of emigrants, as we all are.