“American Idol” continued its descent into death spiral last night. The show fell to 8.3 million total viewers, with a 1.9 in the key demo. An 8.3 is very startling for “Idol,” which not so long ago had 10 or 11 million. Fox execs said not too long ago that the show was “winding down” and now it’s come to pass. Will Fox cancel it? I think it’s a strong possibility. It’s not the fault of the judges. And Jennifer Lopez performed last night! You’d think she would have brought in a few peeps. But JLO has also reached the “mature” phase of her career. She’s not the draw she used to be. And the 1.9 rating in the key demo? Ouch! That’s another all time low for “Idol,” which had been up around 2.7. It means no young people are watching the show.