As it's a keeper league, I would do it. If it improves your team next year I wouldn't think twice. Jump on that waiver and make it happen. My team when I took it over after week 10 was still winless. I knew I wasn't going to make the playoffs, but that didn't stop me from picking up key pieces off the waiver wire each week to improve my chances of winning. No one in my league said squat to me about it.
If anyone says anything about it being a dick move, tell them you are doing what you can to improve your team. If people can't understand that, it's simply because they are upset that they didn't get them for themselves.
For the record, my final 6 weeks, I went 3-3.
10 Team, Points Only, $$ League, Keep 20/25 at seasons end
25 Man Roster, top 20 monthly point getters count
Goalie points W=2pt L=-1pt SHO=2pt
Stamkos, Tavares, Hall, Couture, Hanzal, Wheeler, Stastny, Versteeg, Fisher, Hornqvist, Eriksson, Hodgson, Setoguchi, Turris, Steen, Letang, DRoy, Yakupov, Grabner, Byfuglien, Baertschi
G-Rask, Halak, Schneider