anyone still using such hardware are unlikely to be using a modern kernel anyhow
What those computers are probably not running is modern, full fledged desktops, or the latest Firefox, as they don't have enough power for that. But kernels? Most likely yes.
A few years ago (maybe 4?) my mom had an active Unichrome computer running Arch, obviously with the latest kernel.
All that said, I think it's quite sensible to drop these drivers. Nowadays they are essentially an expensive way to set up VESA anyway, Mesa dropped them long ago and I'm not sure even X.org uses it for 2D accel anymore. If used at all, it's probably only for compositing, given most toolkits now use OpenGL and would use llvmpipe instead. Just use the VESA driver.
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