If car use is set at that level, it will make it inaccessible to many for whom it is genuinely necessary, and also make the cars required for those groups unavailable.
One of the many silly excuses made over the ULEZ - until is was pointed out that 20 year old, £500 Fiestas were compliant.
But there is a fundamental difference between changing how the tax raised by VED and fuel duty is replaced, and changing tax policy so as to proactively deter car use.
By freezing the fuel duty escalator the government is effectively changing tax policy to manipulate (in this case,
encourage) car use. I don't see the difference. It's just a matter of where the government chooses to apply the tax.
Camden, for example, refuses to issue resident's parking permits for cars over 5m in length. I'm OK with that, there's no need for 3 ton Range Rovers in central London. Central government could do the same nationwide if they chose.
We could go the way of Japan and instigate a Kei-car style of enforcement - that way everyone could have access to transport, maybe not the kind of transport they want, but still mobile. Very cheap tax (of whatever form) for a small cheap car, and very heavily taxed, or not allowed at all for larger, heavy cars.
If I recall, VED was graduated previously on emissions - so the highest poluters paid the most. That was a government tax policy that actively discouraged car use. The same could simply applied to smaller electric cars £50, medium electric cars £150, massive electric cars £300 (or whatever range is chosen) - I don't know why a flat £200 was chosen.
There's so many ways to replace the lost fuel duty, it's just how they choose. Driving, especially EVs, is cheap, but we have to accept it will have to become more expensive.
In 2030 what will my choice of sub £2,000 12-15 year old cars be ?.
There will be hundreds of thousands of EVs available to by then. In fact, there are probably a few available now for not much more.