Actually, I do want knobs and switches, for some tasks. Have you ever tried to use siri or the likes while driving? It requires too much cognitive "brainpower", distracting from the real task at hand (driving).
Besides, which is easier: Reach out and twist a round know a little, or say "ok car! lower the temperature by 10 degrees".
Dunno, I still think interfaces should strike a balance between physical and virtual, with the most-used stuff being physical. You would not want to use a touchscreen as your main keyboard at work, would you?