Aww, really? LOL. I saw Little House and thought it was...fun! It wasn't Pygmalion or Gypsy but I had a fun time! That and the tickets were free! Not that the two are directly related, but, free tickets!
The only TV shows I could see working as musicals would be kids shows, specifically for children. That's it, but I'd totally be open to anything if it wanted to try. I don't really think you can knock something until you see it for yourself!
Into the Woods, Beauty and the Beast, RENT, Mamma Mia!, Dr. Jeckyll and Mr. Hyde, Evita (with Julia Murney), Hairspray (with Paul Vogt), Peter and the Starcatchers (with Christian Borle), Lion King, Altar Boyz, Legally Blonde (with Lauren Zackrin).