Is it a given that we (the org) value Grieg over Boucher? I would hope so, but you never know.
Either way, I think there is a lot to gain from adding Klingberg. He would take a lot of pressure off of Chabot and Sanderson offensively. He has also been an effective defensive player before Bowness took over.
Jack Han has a nice article on Klingberg and his recent struggles:
Living Dangerously With John Klingberg
This is still a guy who is top 20 in D points & top 10 in D PP points over the last three years. He would allow us to run a truly stacked PP & rely less on Chabot - lets not forget, this is a guy who was one of the best transition DMen in the league for years, and a guy who has played 22+ min and 19+ min at ES on a team that has 46 playoff games over the last 4 yrs.