Problem with this idea, IMO, is that Sedins with Burrows is still a 1st line with little physical presence, and the entire league knows it. And unfortunately for us, the three of them lack the ability to adapt or change their game enough, meaning they WILL get shutdown. In other words, a Sedin-Sedin-Burrows line's limits and disadvantages are way too predictable for other teams.
As for actually keeping Burrows, i'm all for it unless another team offers considerable value which is doubtful. Even if his talents have diminished with age, he's still one of the hardest and most dedicated players on our team and his loyalty to the Canucks is probably only second to Bieksa. At the very least, he'll play a good role model for the kids.