As a NYR fan, I wouldn't want to trade Lindberg for Ryan Murphy.
Lindberg had a great rookie season, and is a very smart player in all three zones. He's still supremely underrated and while he's not flashy, we still don't know his ceiling. He has the tools and the IQ to have a very long NHL career. Think Dallas Drake, Jere Lehtinen, John Madden, Kris Draper mold.
Not interesting in trading for an undersized defenseman who's stock has only fallen since he was drafted. He certainly still young enough to reach his potential or at least find his niche, but he's just so small, and as a defenseman, that's an injury-plagued career waiting to happen, IMO. He doesn't avoid hits particularly well (doesn't have the escapability of some more successful smaller guys) and I'm not sure his offense translates to the NHL the way it did in Juniors. I used to be a big fan, but he's looked overmatched physically at this level, and he's fast, but not fast enough to make up for it.
I'd do Jensen and Fast for him, sure. Fast is a dime-a-dozen player imo. But Lindberg has too much potential to trade for a lesser player right now. Trading Lindberg for Ryan Murphy would signal that NYR was "giving up" on Lindberg, and I just don't see how they could or would do that at this point.
Ryan Murphy's value is that of a 2nd or 3rd round pick right now, IMO.