The electric car will make the classic car the modern horse: slow, smelly and annoyingly slow to drive past; and most importantly a rare luxury item! There is still hay / straw and farriers about but less of them and more expensive.
As for electrifying horses - well the parallels stop there. But sure a few people will electrify their cars as a novelty or money is no issue. But a classic car isn’t the same without the sound, the smell of oil and fuel when you get in or the way you wear one like a tailored suit when you drive as opposed to operating the controls of a modern Audi /Tesla and feeling detached from the sensory feast of sounds, smells, feel, vibrations and skills to keep the car on the boil.
How often do you get out of a Z with your head slightly light from the fumes, your ears ringing from the sounds and your head tired from “driving” the beast and think God that was a terrible drive? Or do you go to bed with that tired head, close your eyes and relive the sounds and feel of what just came to pass? Now doth my pen halt! Or shall I say my thumbs stop on my cracked iPhone screen! Maybe I should use parchment, a quill and ink well to savour the feel and the smell ...