if by "funny" you mean "unlikely to do anything meaningful with regard to content we don't outgear by an entire content patch." then sure.
But real talk here. Nearly all solo class guilds are either outright failures, or they're druid guilds. Druids are the only class that can do nearly everything needed to raid, but they're still deficient in some aspects. No hero/lust. several buffs/debuffs missing (though this is less of an issue in cata due to buff homogenization).
DKs get it worse. There are no ranged classes, no misdirect/tricks, no buffs save horn and abom's might and icy talons. And unholy frenzy. No pawprint, no stam buff, no thousand and one buffs and debuffs that normally work. No cleansing. No dispells. No healing. I can think of several bosses you could not down regardless of gear levels due to mechanics.
Plus, blut dps. HAHAHAHAHAHHAHAHAHA.
I want to find where you live, come over, and laugh in your face untill you realize how useless that is.
Blood needs vengence to dps. Blut can't get vengence without tanking damage. and it wears off fairly fast. Ergo you're gonna be tank swapping at a fair clip.
Also, even with vengence, you're looking at about 3 bluts for one regular dps, so you're going into a raid gimped in damage, and have zero healing.
tl;dr; this isn't gonna work, you're awful for thinking it would, and I hope you get humiliated in public for suggesting it.