Depends on how good your team is. Your post isn't a great indication of your team and your league.
If you feel Kaberle can help you win this coming year I'd go for it, and even if you don't like your chances Kaberle looks to be a big time upgrade over both Eminger and Sulzer; so I guess do the trade unless your in a rebuild phase.
Everyone and their mom knows Kaberle isn't a number1 defenseman anymore, but I really believe he'll bounce back this year. He has a rough year after winning the cup and coming to camp out of shape. He changed teams 3 times in a year.
I think this year he'll be more focused, will know what's expected of him better in Montreal, and should have a good year as #3-#4.