The anti-EV brigade (some funded by those with vested interests, others just going along with it because they like the sound of their petrol engine going 'vroom vroom') will fade away.
The fossil fuel companies won't waste money once the battle is lost, and some will reluctantly acknowledge the need to do more themselves (EV charging that is done properly, not so badly it's as if they want to make the experience bad so people go back to petrol/diesel).
A lot of the die-hard petrolheads will die off, literally, and the rest will at some point have been in so many electric cars, buses, coaches or vans driven by others that they'll find it hard to keep spouting the same myths over and over. Nobody will care. They'll eventually capitulate and switch.
Only those with true classic cars will want to keep an ICE car. They'll almost certainly be driving an EV day to day, perhaps taking their ICE car in a trailer towed by their EV to a track every once in a while.
Others will convert their classics to electric, and there have been some stunning conversions to older cars from the 70s and 80s (and older) which will likely only continue to grow as a way to keep such vehicles on the road without paying the crazy costs of fuel ten years from now. Not least many ICE cars may end up banned from city centres as low emission zones become zero emission zones.
So, long story short, I don't think we'll see the incentives remain for EVs for that long because prices should come down markedly anyway (they already are). As said above, unless we do something silly like ban Chinese EVs to help the incumbents, competition should bring prices down.
The few remaining ICE cars, and hybrids, will have got to the point where they're now more expensive to make because of the limited quantities made - so that too will swing sales towards EVs.
If the car makers think that axing targets means they can just go back to selling loads of 'cheap' 1 litre 3 cylinder petrol cars for city cars and whatever engine they pick for your family SUV/crossover, it will be pointless because everyone will have experienced the comfort and performance of an EV by then - a family member, relative, taxi driver etc. Why would they want a noisy car that costs 2-3 times more to service every year and fuel is now even more expensive, plus a lot of petrol stations have closed?
We are very much at the point where we can say;
Do you think that the UK switching to electric vehicles is realistic?
Yes. It's happening now and can't be stopped.