I can imagine a lot of United fans would prefer to see Liverpool relegated. The rivalry really does run that deep, and that's what makes it so fascinating.
For me personally it would be fabulous to see Liverpool go down, yet I think the joy would be short lived as the Premier League wouldn't be the same. Loathe them we might, yet I think many of us would also admit to them being arguably our fiercest rival. I get most nervous at our games against Liverpool - we could be scrapping for sixth place in the table, but it doesn't matter, that game always seems to matter more than the others. And if you're romantic about football history, Liverpool and United are, in my opinion, the two stand-out clubs in world sport.
Given our own troubles right now, I'd take the title.