I hear what you are saying, and Pominville still gets himself into good shooting positions. However, you are still speculating an increase in production, even though he got prime minutes and linemates all year long.
Granlund needs a finisher who will actually finish. The defense and Dubnyk cannot have players who cough up the puck in the neutral zone or at the offensive blueline.
I'm making an educated guess, that Pominville didn't turn into a 7% shooter overnight, while all other aspects of his game remained constant or improved.
Every year you see it. A player will have a bad shooting year and score less goals, next year his shooting will rebound and be back to his normal production levels.
34 year old Radim Vrbata just had this happen. in 13/14 he shot a dismal 7.5% on 260ish shots, and only had 20 goals. In 14/15, he shot a closer to norm 11.5% and had 31 goals on 260ish shots. All his underlying numbers stayed constant(just like Pominville).
Zetterberg shot 6.5% in the lockout season and got 11 goals in 46 games, rebounded with a 10% and potted 16 in 45 games before his Olympic injury in 13/14.
Steens hit both ends of the spectrum with an 8 goal 6.2% in 12/13, to 16% in a 33 goal 13/14 to a happy medium of 24 goal 10.8% 14/15.
Saying 7.6% is Pominville's new norm is as ridiculous as it would have been for any of those other older scoring wingers. As long as he maintains his underlying numbers, he's going to be fine and a net positive for the Wild.