I have no idea what the best plan is going forward. The powerplay being somewhat successful is a nice surprise, but everything else has been pretty underwhelming. I'm confident our offense will fine moving forward, adding Demidov and Laine should give us a decent boost next season.
I'd give St. Louis until the end of the year and compare the team's 1st, 2nd, 3rd and 4th quarters of the season to see if he can get some progression going on the defensive end, if not I'd have him gone come April.
At the deadline I'd look to move Matheson since he's filling the same role we want Hutson to fill. And I'd move out Savard since he'll be ancient once we're actually contending.
Then in the offseason we'd ideally target a defensively responsible 2nd pair guy for the right and left sides in the 25-30 year old range, and potentially a 2C depending on how Dach's season pans out.
There's plenty of stuff left to iron out before next season starts, but they better use this time to scout out some potential pieces to add going forward.