>it would take decades to get rid of all ICE vehicles
If governments were serious and fair about it, they'd just provide decent subsidies (or similar formula) to people who don't have enough money to switch, and it'd happen faster. What's going to happen though, is that many governments will just tax ICE vehicles to death (+ the cheaper chinese vehicles) while blaming you for not having enough money to switch.
Another approach is to incentivise middle to high income earners like Australia has done re novated leases on EVs being exempt from fringe benefits tax.
Lower income people aren't buying new cars, they buy second hand.
So be incentivising others to purchase new EVs over combustion, it creates a supply for the second hand market in 5-10 year horizon for those lower income earners. And while subsidies are in place for new models, this further pushes down the price of used EVs.
It'll be interesting what happens to Australias second hand EV market when the subsidies end in 2029.
France does this. It's called social leasing and is offered for those with low income but reasonable work related mileage.
It could be argued that just returning the tax money to the people (and/or reducing regressive taxes) is a fairer approach as it gives money to those who cycle or take public transport as well as those who switch to EVs.
I've seen governments give tax incentives to buy EVs that are then sold 2-5 years later, pumping a secondary market of second hand EVs. Cheaper for the government (they don't pay, they just take less tax).
Beware the the "fair". Currently, governments are taking in vast amounts through fuel taxes. That will need to be replaced. It wont be an extra fee at registration. Current politics favors use taxes. As the concept of taxing electricity going into cars is a massive cluster of issues (ie the "smart grid" with differemt rates for different uses) the answer will likely be road pricing: a per-mile fee, which could mean manditory tracking. The transition to EVs as fair market actors is not over. It hasnt really begun.
Govts could do a lot of things. They could require employers to offer remote work (like during COVID) or provide free charging. Its a lot easier for big corporate buildings, mostly shared by many corps, and have a parking garage to add chargers. They also can negotiate aggressively with utilities and just get EVs charged for free. 20%+ of solar is curtailed anyways, which is only going to increase. Or they can add solar panels. Businesses in every country have tons and tons of incentives and subsidies for all kind of things. Govts have absolutely no problems giving incentives to businesses. Its only when regular people get a tiny benefit for a limited amount of time, everyone kicks up a fuss ..