>> our drivers don't utilize [Terascale] gpus significantly differently than the R200s

>At least for now there's still a significant difference: one is 3D-supported, the other isn't

Good point. Earlier cards have 3D support. And the R200s even have Warp3D support.

>> If the OS doesn't support [OpenGL 3.3] functionality, does it matter?

>At least porting more recent games (OpenGL 3.3 is from 2010) may require newer OpenGL than MorphOS currently provides.

An update to TinyGL would be nice.
OpenGL 3.3 would be a good target, better than OpenGL ES.