It will have to be road pricing - separate meters is too complicated, expensive and open to fraudWould petrochemical fuel be more expensive even now if it didn't have both fuel tax and then VAT on top? What makes you think HMG will walk away from the vast amount of revenue ICE fuel sales provide? (£28 Billion in Fuel Tax alone in 2019/20) There will either be road pricing or a requirement for separate metering with the latter paying a road vehicle fuel tax supplement as now. For many users, the future will most likely be far more expensive than today.
I'm perhaps a tad cynical on all this. As a teenager in the 1960s when the country was investing heavily in the first and second generation nukes, it was a common assertion in the press and on TV science programmes like 'Tomorrow's World' that electricity would be almost free once generating plant capital costs were covered, the marginal costs of producing power being so low.
I've never owned a new vehicle in my life and recent ICE petrol cars have a potentially massively long life, not recent diesel sadly with all the EU emissions control bells & whistles strapped all over them, giving long and good value second/third/fourth hand ownership possibilities. As another 70-plus year old friend in the same boat (even more so as he owns both pre-war vintage cars and a more recent but still very elderly Saab 900 Turbo) says, what is the battery life and actual driving ranges of three, four, five year old EVs? There is already a Youtube video around of a Finnish s/h Tesla owner having his car dynamited as the battery failed after only a few years running and the replacement cost is 17,000 Euros - only Tesla has told him that only they can replace the battery, and they'd have to consider whether that even feasible at any price.
Road pricing is also fairer - the more you use the roads, the more you pay
As for battery life - if you drive an ev full blast every day and fast charge it every day then yes, the battery life will be reduced - but that's no different from boy racers burning out the engines in their cars by having a heavy right foot and very few brain cells
Home charge at 7kW and driven sensibly, ev batteries will still have at least 70-80% of their original capacity when they are much older than the current typical manufacturer warranty of 8 years
For every ev that has battery problems because of over zealous driving there are many with more than 100,000 miles on the clock and still giving their owners more than enough range for everyday use
Cheers
Bruce