Here are a couple of shots from a presentation made by Harmonix founder and CEO Alex Rigopoulos in which he talks about the pros and cons they considered when trying to decide whether or not to make a guitar game:
Photo courtesy of Miss Fipi Lele.
The “pro” argument is all you’d need to convince me!
Update: It looks as though Jeff “Coding Horror” Atwood beat me to the punch and has even more details. Damn you, Atwoooooood!