My biggest issue with waiting one more year is that the planets really seem to be aligning for us this season. Zetterberg's having an absolute best-case scenario campaign, and the same can probably be said of Datsyuk. (If Datsyuk or Zetterberg starts to falter, we're not winning the Cup. Unless we add a top-end centerman.) Howard's been great, and we've basically been able to spot him a few weeks of rest without it impacting our place in the standings. Special teams, shot suppression, puck possession - our underlying numbers are really damn good for a team that doesn't have any prime-years all-star studs. The East, again, is as wide open as it's ever going to be, and we're right there at the top. This might be (but likely isn't) Babcock's last go-around with the Wings. Maybe most importantly, Babcock and Holland have pretty much come out and said that this team is a year or more ahead of schedule - so whatever The Plan was in the fall, it's safe to say it's changed, or has at least been accelerated.
If we add a top-three defenseman, one who can move the puck and put up points and play big minutes, we're as good as any team in the East. If The Right Deal presents itself, Holland should go for it. Strike while the iron is hot. If The Right Deal doesn't present itself...well, I'll be highly skeptical. But I'm used to trade deadline disappointment. Que sera, sera.