Well, it took nearly 2 years for 3DFX to fully lose brand recognition.
But... Contrarly to nVidia, they didn't have parts which were near in performance to their competition. The V5 5500 got killed by the GF2 GTS.
Two years before 3dfx fell, the V3 3000 was out, not the V5 5500, and it was about as good as the competition at that time (it was a little faster than nvidia's alternative TNT2, but only 24-bit color in 3d), and 3dfx was making us big promises for the future at that time. I'd say the analogy is (so far) in-tact.