Theoretically, yes
as currently it is still possible that the Nvidia Web Drivers have some metal support for the older cards... We know for sure that there
will be updated Web Drivers, we just don't know how much hardware they will cover. Definitely Maxwell and Pascal, Kepler nearly 100% (but already in native drivers), Fermi maybe, Tesla possibly. I don't want to sugarcoat it too much. We can still try the kextload and the hope that WindowServer has an OpenGL UI mode and that the kexts load.
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Yup. When booting, hold Command-R. Once booted, enter Utilities *at top* and terminal. Then, 'csrutil disable'. Don't worry, many hundreds of people will thank you for this one time thing
Oh, the good ole' days of doing: sudo rm -rf /
Do NOT, EVER run that command. EVER. No exceptions.