American-accented english IS becoming the norm.
When I hear most people speaking english as a second language they are speaking it with an 'American' accent. I think that trend will continue.
Most scandinavians speak english with an american accent and they are right next to Britain.
Not exactly, break out a map and you'll see there's a good few hundred miles between this fair isle and Sweden, Norway etc. Also, my accent is markedly different from, say a person living about twenty miles away, so just because two locations may be geographically close, does not mean people in both locations will sound the same.