If Vrbata continues to struggle 5v5, I think Burrows should be moved up to the first line when he returns.
I don't think we're really approaching that point just yet. Especially with Burrows suspended anyway...
But there is some merit to this idea. At times, the Sedins and a particular Linemate seem to get a bit too carried away with doing things one way. Just like the days when everything was clicking like crazy, when Burrows+Twins stagnated, Samuelsson was swapped in. Gave two very different, and effective looks. Just a little spark to rejuvenate things every now and then.
Sometimes it seems like the Sedins just need a little shakeup that forces them to change things up and reevaluate some of the details of their game, do things a bit differently, etc. At some point, a stint with Burrows and Vrbata swapping places makes all kinds of sense.
Probably a ways off though before we really have to start considering that.