Eriksson would spend very little 5v5 time with the twins. Vrbata 2.0 problem.
They're a great line on international ice with the extra time, space and less physicality. On NHL ice, the twins function far better with a puck retrieving, 2 way, board/corner battling, net presence triplet (a Burrows, Hansen etc).
If we did sign Eriksson, he'd almost certainly be on our 2nd line.
Sedin, Sedin, Hansen
Baer, Sutter, Eriksson/other UFA
Rodin, Horvat, Virtanen/Burrows (one of which in Utica)
Etem, Granlund, Dorsett
Only UFA I see displacing Hansen would be Okposo.