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.
Maybe if you happen to be from the mid-Atlantic region (which itself covers a huge area with many, many different accents) you don't notice your own voice as accented, but someone from any other place in the world will. There's no such thing as "no accent at all."