As someone who's watched him play in Finland for the last few years, I wouldn't worry at this point. His overall game is a work in progress, he only got into it last spring. He needs to find a balance between a solid overall game and his best attribute (the goal-scoring). I'm not sure if many of you here understand exactly how large the difference between his best and worst game has been. He's finally started to find some consistency in his game, meaning that even if he's not scoring, he's much less invisible than he used to be.
The way I see it, we're dealing with a 20-year-old who's still growing both as a player and as a person. He has seemed very young to me in interviews, Ristolainen on the other hand has come off as more mature. Armia is on the right track at the moment and as long as he stays on it, he should have a fine future ahead of him. As long as he doesn't check out for good and give up due to his lack of scoring or other difficulties in adapting, I wouldn't worry. I think this season is going to be very trying for him, mentally in particular. He could have a lot of growing pains. If he makes it through this season without giving up, I think he'll make it and be good for you guys and hopefully soon for Team Finland as well.
Just my 2 cents.