I'd like to see a reasonably-standard C++ API specification for at least a few graphics-related things (and perhaps more over time), but am not sure if writing a graphics API with the sole goal of eliminating all other APIs or libraries, would make any sense. The people with whom I've talked to, some of whom have done work on P0267/io2d, don't seem to be explicitly aiming for this either, but perhaps I've missed something.

I'd be happy to see vec2/vec3/vec4 style APIs in the C++ standard, too. P0267/io2d does have some support for this, although I think it could certainly stand to get some love + attention!