The problem with Jones is the term. The main reason to trade Dubnyk is to free up a spot for a more reliable goaltender to play in front of Kahkonen as he gets his footing in the NHL. Taking on 4 years of Jones at any price, with any sweeteners is a problem that Minnesota is unlikely to want.
If Dubnyk has value it's with substantial retention as a cheap, low-commitment backup in a financially uncertain season. He's a fling; Jones is a marriage.
For sure the term is the biggest issue with Jones. I feel the best attempt at moving Jones is going to be for a similarly termed forward that Minnesota doesn't really have. The closest is Rask. I don't see the difference between the two being so ginormous as some might try to make it be but it can be done. I don't think the Sharks will move Jones this year because there was some improvement in his play when the coaching changes happened and he started being coached by Nabokov instead of Hedberg so odds are they will feel the best bet is to give him another season under new coaching to see if that slight turnaround can be made into something more consistent.