Norway is not a part of EU, so that's apparently not going to happen anytime soon!
That said, looking at the arrivals at Oslo, we have flights to Fort Lauderdale (788), San Francisco (788), Los Angeles (788), Newark Liberty Intl x2 daily dep (752 & A332), JFK x2 (788 & A332), We have Bangkok, Dubai & Doha with 777-300ER going every day with Emirates and Qatar...
I would know, I work at OSL...
Apology on the EU and norway, as I am not familiar on that. however...
looking at ITA, one way, search on june 9 -> one month non stop
we have flights to Fort Lauderdale (788) - twice every week
San Francisco (788) - empty
Los Angeles - twice every week
I took another quick look in another gameworld that is in 2017 and jfk ewr sfo lax has more then 150 pax average per day. So I think it is quite reasonable.
I assume the reason you are seeing less demand is due to you are in a gameworld that is still in the 90's and demand has not grown to the point it has 150+ pax per day and pretty much you have to wait.