I think he'll do better than Radcliffe or Criss as he's used to performing musically on stage. However, I have no idea what his voice will sound like after 8 shows a week. He sang poorly on live TV with his brothers when they were on tour and their voices sounded shot.
As far as poor sales, I kind of expected this. Aren't the Jonas Brothers kinda over. Haven't they been eclipsed by GLEE, Bieber, Big Time Rush and all the other tween acts (Gomez, Lovato, )
"The sexual energy between the mother and son really concerns me!"-random woman behind me at Next to Normal
"I want to meet him after and bang him!"-random woman who exposed her breasts at Rock of Ages, referring to James Carpinello