Ever since Chelsea appeared as a teen, after being buried not once......but twice (after being stillborn) it is apparent anyone can be brought back to life. Bad enough it happened to Stefano countless times, even when he was given several terminal ailments.....did not matter. He continued to live on, in seemingly good health, smoked his cigars, drank his brandy, etc.
(For those unaware, Chelsea was born in a swamp area while traveling, was stillborn, named Georgia by her mother, Billie. Was buried in that Georgia swamp by the midwife & her two sons, with Billie present. Later, some storm unearthed the little coffin, so the two sons brought it to Salem to give to Billie, and subsequently was buried in the Salem cemetery)
Daniel Rafael could easily be brought back, but I think the show prefers that Nicole constantly suffer misery in her life. The actress really is able to emotionally show sorrow, sadness, very well. Better than any of the rest of the cast....so heck, take advantage and heap it all on Nicole.