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I acknowledge that in the US the term "velomobile" might be used differently. Let me explain, how the term is used in Europe (Germany and Netherlands at least - velomobile hotspots).
First off: In my view, your argument is flawed: You don't call a motorcycle (single track) a car (two tracks), do you?
Velomobiles originated in France before WWI (Mochet-car - two tracks, four wheels). They have been "reinvented" as commercial products in Denmark and the Netherlands (Leitra-Velomobile, three tracks, three wheels and Alleweder Velomobile, also three tracks, three wheels).
Velomobiles are recumbent tricycles or quadricyles with a fairing. You just need three+ wheels or you will fucking fall over when stopping, making single track bents with fairings basically unusable.
Initially velomobiles were designed as practical vehicles for everyday use with weather protection with additional speed improvement. In the last 15 years development used new materials to make them lighter and faster but they still retain a three-wheel setup (the quattrovelo is a recent four wheel, two track addition that is quite exotic) because only in this configuration the vehicle is practical for what it is designed for.
