I don't think it is for the Elvis hardcore market. Think of last year:
A little less conversation was a megaseller, not only for hardcore Elvis fans. It was also a dancefloor hit in the clubs, everywhere.
I also bought the Sintra Duets and Iam not a big Frankie Fan. But the idea was good, the arrangements were good.
We need ideas to hold Elvis in the current market. ALLC was a big surprise, a risk but it WORKED.
Lisas Don't cry Daddy in 1997 was great, but they never releases it officially. It would became a megahit.
I guess there is potential for Elvis Duet songs.