No idea why they don't do this. How amazing would it be to program in an EA Sports World Tournament every other year in Feb or Sept (depending on Olympics or World Cup).
Then simply ask DO YOU WANT TO PLAY when that time on the calendar comes up. Select yes, pick your team, then you fill out your 14F/8D/3G from the current rosters/overalls in your Dynasty (BAGM). This would take into account current injuries (imagine if Crosby was out? ouch!) as well as overalls (hello Connor McDavid in 2016 Olympics)
It would be so amazing. But nope, why do something that is awesome. Yay EA