Disclaimer, obviously I have no say in this matter since I am not Russell Wilson nor the offensive coordinator, but I just watched a video of RW highlights and Sidney made some ridiculous catches this season. I think one of the biggest things that could happen this off season is RW and Sidney developing more chemistry so he can truly be a #1 target for us. There were some throws this year that had no reason to be caught and he just snagged it out of the air. If they can grow together so RW doesn't need to run around in the backfield looking for a pass (even though that's one of his best talents), I don't see why he couldn't become a 10+ pass attempt per game receiver for us.
In the final few weeks of our season there were a few plays where Sidney was wiiiide open and due to pressure/not seeing him he didn't get the ball. I am hoping film studies over the offseason with the WR crew can make them a dominate force in the NFL for years to come.