Smacked with the 'legacy' stick
Apparently some of my video cards are now officially decrepit. A recent world emerge broke X for me because my two nvidia geforce FX5500 cards are now on nvidia's 'legacy' list, and no longer supported by the latest (or future) drivers. It's nothing a quick edit to /etc/portage/package.mask didn't fix:
>=x11-drivers/nvidia-drivers-177.0.0
Then the following steps got me back up and running:
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emerge -avt nvidia-drivers
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update-modules