Soldato
There's the fuel saving to take into account.
If like me you are going to be saving £100 a month on fuel. That's an extra £100 per month that can go to fund the car.
Others will save significantly more as we only do a combined 9k a year across 2 cars.
So if I'm willing to spend say £200 a month on a car that can now become £300 a month for an electric car.
Bare in mind electric cars have less moving parts, nothing really needs replacing or repairing bar tyres.
Take those savings into accounts then people can probably put an extra £150 minimum on top of their normal car budget. Likely a lot more.
I agree with you at the moment, however I would be surprised if those low running costs remain once EV becomes the norm rather than than a small percentage.
Why? Because tax.
Say you have an average MPG of 40 in your petrol car, at 113.5p/l, that's £5.15/gal = ~13p/mile
However, a quick google (https://www.racfoundation.org/data/uk-daily-fuel-table-with-breakdown) suggests that of that 113.5p, only ~37p is actually the cost of the fuel + delivery/distribution/retail, the remaining ~77p is all tax.
Using that figure, your actual fuel costs are more like 37p/l = £1.68/gal = ~4p/mile, which is basically the same as running an EV.
The government are clearly not going to be happy about losing that ~9p mile in tax, considering it accounts for a total of ~28bn/year.
At some point EV mileage is going to be hit with equivalent levels of taxation* - it's inevitable - at which point the above is no longer going to be true (although by this point, hopefully EVs will be at price parity with ICE).