I wouldn't mind doing BWL/MC/Naxx just to see the content. 

But doing Naxx to get geared seems kinda strange, why not just do BC content for gear?  Isn't it kinda on par with Naxx stuff anyways?

Just to compare a couple of pieces 

[itemico]Mask of Pennance[/itemico]  a drop from Steamvaults vs. Tier 3 Pally helm from Naxx [itemico]Redemption Headpiece[/itemico]

Doesn't really seem like getting that helm from a 40 man raid would do me much better than getting the helm from five man instance.  Just me though, but like I said I'd sure love to see the content.