Will everyone eventually have a North American sounding or similar accent?

Hi I'm from Ireland and I'm a 25 year old man. Ever since my mid teens I've noticed that more and more people sound a bit North American or try to and use some of their expressions, such as 'dude', 'awesome' and 'oh snap'. It seems too the most likely people to behave so are the more well off people in our country. I don't mind people who are actually from this region or lived there for some time sounding so but when I hear people here who I know are Irish sounding so I just think it's awful. I mean what's wrong with our accent? There's no reason to sound like that. I lived in Canada for sometime which has a similar sounding accent and uses a lot of the American expressions but I never picked it up. In my opinion it's obviously that part of the worlds major cultural influence that is the reason for this trend. I have seen in documentaries and read and anyone will agree that English is now the main language in the world. Countries all over the world have it taught in schools and it is the language of business and diplomacy, if you want to be successful your chances are better with English. In my opinion because of the spread and dominance of English all languages will fade and there will only be the dominant language of the global age and it's accent will be the North American, all others faded. Countries might still learn or know their first national language but the spoken will be English. Does anyone have any more information on this? Or let me know what you think. P.S. To any Americans reading no one and I mean no one in Ireland says 'Top o the mornin to ya', and speaking Irish is not speaking with an Irish accent, it's speaking an actual language called Irish or Gaeilge.