Upon further thought, I believe that this would be a very viable buff build for a number of fights - freya, iron council, thorim and others.
Because blood's deeper talents are almost entirely talents which boost your damage and threat but don't give any significant survivability (except for WotN, which has been gutted and is of subjective value), speccing this way on fights where threat doesn't matter much may be quite viable for you because you then bring your raid hysteria, abom's might, imp icy touch and imp talons all in one package meaning a talented attack speed debuff, imp windfury and a marks hunter aren't needed, nor are any frost DKs. You essentially become the only DK your raid needs assuming they have a boomkin, which could be construed as a bad thing, heh. Your overall survivability is about the same - trading WotN for 3% melee avoidance in frigid dreadplate is an alright tradeoff. You use death strike to generate death runes and rune strike remains your primary threat generator. Rotation would be IT PS DS BSx2, DS BSx4 -or- DSx2 BSx2.
On Freya threat is a nonissue since if tanking her, you'll have a gigantic threat lead by phase 2 when people actually start nuking her. Ditto iron council (if doing steelbreaker last), nobody will be nuking your target until phase 3 if you're the guy tanking steelbreaker through phases 1 and 2. You could also tank cats on auriaya if doing the achievement there, offtank guardian dwarves on razorscale, etc.
It's a situational build but depending on your raid comp it should be a very viable build for you to bring to your raid to boost RDPS while still being able to fill your role acceptably, and it allows other people in the raid to spec out of utility talents that you bring so they can do more DPS themselves.
Presuming people agree, this build should be the definitive solution for people who insist on speccing blood but deep into frost to get frigid dreadplate. If people are going to insist on doing this, they should at least bring their raid something worthwhile in doing so.