But there are (at least) 12-20 DAWs, each with their own (internal) abstraction designs. It's bad enough having to write (or being able to write) plugins for:
AAX, VST, AU, LV2 (at least)
Now you'd be talking about 12-20+ different "plugin APIs". That's not going to fly.
As per your other comment, it seems things are already going in that direction, if developers are treating their plugins as being written in a format that could be described as "AU that is compatible with Logic but nothing else" or something like that (substitute for any format/DAW combination that the developer wants). So I would say that in a way it has already flown regardless of how we feel about it.
