Absolutely, this idea that the whole of society are going to adopt electric cars is a complete fantasy.
I agree with you. I've seen enough people far smarter than me suggesting it's impossible to replace all vehicles on a 1:1 basis. There are lots of reasons to be sceptical about electric/hydrogen vehicles; their hidden environmental cost, questionable safety, impractical construction, and the fact that they won't resolve many of the problems their supporters claim.
I think it's irrelevant to criticise electric cars on the basis that they will be beyond the means of poorer people. Electric cars will be insignificant to anyone on the poverty line, because they don't have access to a car now.
On the other hand, politicians, media and lobbyists adverse to change will like this argument, because it sounds caring and avoids the elephant in the room*, namely that we need to change our cities and lifestyles, not our propulsion systems.
*
Not that I'm accusing @Gunk of using it for this reason.