I was never a big Billy Idol fan, but I'm glad he's making a comeback. Anything that helps correct the course of rock back to its proper direction is fine by me. He's one more counterweight against rap/rock, dry-heaving metal and nu-metal.
I always kinda liked him. I saw a VH1 program about him a while back, and it was funny to see Idol, in rock and roll I don't care sneer persona, and then a cut to his very prim and proper English parents.