Anything can be a musical if it makes sense for it to be a musical.
There's really no way to duplicate how someone gets from the beginning to the end of an idea.
When you write a show, you just never know if it will have a future or if the show will end up ever having a production, but, that doesn't mean that the songs - the best of the best songs - can't be pulled out and put on a CD. And, if the shows that they come from end up happening, then people will regard this as like a quirky little concept recording. And, if the shows don't end up happening, at least the songs will live on in some capacity.
There is nothing better than getting something in front of an audience in a less stressful setting than previews!