Ooh, I like Laith on The Voice. He's really good. I'm glad he made it to the finals. It doesn't look like he has a shot to win it, but he had a great run.
I'm not understanding the issue in the article. It sounds more like a licensing issue. If the owners to her image agree, then it's a go. Is it a good idea? The viewers get to decide that.
Singing duets with dead people has already been done though. Natalie Cole singing a duet with her dead father, Nat King Cole, on film was done a long time ago.