I don't think it will make much difference. My brother is one of these people and he is happy to pay the mega initial road tax to drive around in his fucking ridiculous vehicle, a bit extra to park would be water off a duck's back.
Haringey currently has a proposal based on length but it's only an extra 5%/10% of the parking fee and if it's electric or hybrid that is already pretty low.
https://www.bbc.co.uk/news/articles/c3dej2pypd2o.amp
Fully behind this. Doubt it'll actually put put people off owning them though.