Well, if the "Magic Blood" plot device rumor is true, then I have some cause to be a bit set aside, but other than that, I'm going. That sounds like something Damon Lindelof would do.
Meh. No different than Spock being reborn on the Genesis planet; or an entire Genesis device creating life out of nothing; or the spores in "This Side of Paradise" providing perfect health; or Nomad bringing Scotty back to life; or the Ba'ku's planet's ability to stop aging.
And of course, there's the amazing red matter.
Genetically enhanced blood having restorative properties is actually a little bit more
believable and truer to real science fiction than the stuff mentioned above. Also, and I'll put this part in spoilers just in case,
Edited to add: