The lower cost of operation of an EV is quite an inducement to switch, and will leave many ICE cars behind as owners decide they are no longer desirable to own or drive. The range of electric car brands and options in Europe shows this to be true. EVs aren't just a new kind of car, they're better and cheaper to run.
Outside of some fringe scenarios, it's pretty hard to be worse in terms of cost of operation from an actual comparable ICE car. Even the slowest EV on the market is quite a bit more 'performance' oriented than something like a Prius... and if you start getting into faster cars (not even necessarily BMWs, but something like a top tier Accord), mpg drops accordingly down into the 30s and op cost goes back up.
Not really, for example the youtube channel Fast Lane truck did a simple towing test of the F150 Lightening and it cost them more per mile to charge at retail charging then it cost per mile to fill up with gas of a similar F150, and that was even with the inflated Gas Prices
Sure if you are only ever home charging, overnight, off peak then yea that will be cheaper than Gas
But if you have to use Fast Charging, from a retail station, chances are your cost to charge your EV will be pretty comparable to the cost of Gas.