AVERAGE singer??? Didn't you read the Wikipedia quote I posted? Even Pavarotti was impressed by Paul Potts when he was getting lessons in Italy. He will make money...and stick around for a LONG time.
LOL. No, he will not last. He's not the next Caruso, Mario Lanza, Pavarotti, or Domingo. I love your enthusiasm, but he's average at best. If he were the singer you claim, he would already be singing in La Scala, Metropolitan Opera, or a host of other opera houses. No way he could sing a complete opera production! He sounds like a talented student who is not well-trained and discliplined.
His first CD will sell pretty well, only because only because there is irrational emotion about this his personal story. If or when he records a second CD, it will hardly sell like this first one. Not even close.