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While every tank needs some form of self-sustain, direct heals don't really fit in with DRK's aesthetic. We're more likely to drain an opponent's HP and MP to keep ourselves alive. DRK is definitely in need of self-sustain, though.
Sole Survivor has a few issues. The 15 duration seems a little too easy to time, and there's no real benefit to applying it earlier over waiting until the last second to guarantee that the mob dies with it active. The benefit to self-sustain is limited by the fact that it requires a mob to die and that it's on a 2 minute recast. The name "Sole Survivor" might suggest otherwise, but it offers next to no survival value when solo. Its main use is to boost your MP, which you can then turn into potency.