Well, in our programming world new languages seem to come out every week, trying to find better ways to write programs. By this standard a new way to encode music is long overdue.
In that metaphor, coming up with a new way to encode music is like releasing a new programming language and then asking everyone to write their own compiler for it. Not impossible, but it would have to be a hell of an encoding!
Maybe not as many as programming languages, but new notations do appear time to time. It's just that none has ever got as popular as the traditional notation, I guess.
