where people have to pester software companies to adopt in a limited form.
There's a context for everything. A single card not performing as well as a crossfire setup in OpenCL? For most users that is not a huge problem unless you are into generating rainbow tables or complex simulations built on that platform.
A single (or crossfired) card not able to accelerate H.264 video, cannot upscale on high resolution monitors and cannot handle applications where "driver optimisations" (read: artificial performance) are not applicable? That is major for a huge audience of users.