Really? Then how do we have progress? I mean, I prefer current notation, but who's to say that this is the best possible notation to express musical ideas? Although Hummingbird isn't going to supplant it for a lot of reasons, there may be a better system that will.
We do have progress by fixing broken things and by gradually improving working things. This did happend already over (quite some) time with the current notation.
Not all progress is gradual. Sometimes we need a complete overhaul. In this case, I don't see the need, but if there is something that much better than current notation, then I would hope that it does supplant this.
