He has all the skill in the world. He just needs to be consistent.
As for who he should play with, the notion that he could be on a scoring third line with Vey and someone next year is pretty promising. Higgins / Bonino / Vrbata is a good two-way second line that hopefully comes out ahead of the opposition, as is the Sedin line. Whether you put Burrows or Kassian with Vey and Baertschi, you've got a line that can hopefully feast on the soft underbelly of teams that may not have the depth to deal with the skill and offensive hockey sense of that line.
A line of Baertschi / Vey / Kassian would get feasted on. It would be offensively interesting, but a defensive nightmare.
I would think Baertschi might get slotted in alongside Bonino, maybe with Vrbata on the right wing. Keep Kassian with the Twins, Burrows and Higgins with Matthias/Richardson/Vey and then Horvat with Hansen and Virtanen/Kenins.
But that is all extremely speculative, obviously. Lots can change.