I don't know the details of his health. But, IMHO, whatever comes out will carry more weight while he's alive than after his death. I think it's smart for him with his family to come out from hiding.
Having said that, I don't respect Felt for what he did. I learned my distrust for the press through my father during Watergate. We even got to show our support for Nixon as he flew out from Andrews during all that turmoil. Nixon will always be loved by my family.
Well, now we know just WHY Nixon was so paranoid. Hopefully, after all these years the truth will come out.