They can only be sold with huge reductions on list price.....and that was with no VED, future pay per mile, and Khan tax.
Sales will drop even further now.
......but at least we'll be able to buy one for buttons. 
This is the upside for me.
In reality, the additional tax doesn't tip the cost argument back to ICE vehicles. Despite being a fat SUV, the iX costs us around 3.5p per mile to fuel, so even adding on a ved charge of 3p still makes the per mile cost the same as a diesel that can average 100mpg, which obviously doesn't exist and certainly not in the form of a big, comfy 5 seater barge. Maintenance is also a lot cheaper than for an equivalent ICE car.
Also, I'm not sure I buy the 'EV's are heavier so they wear out the roads' argument as, presumably those same cars should be wearing their tyres quicker too? In my case my car is still on its original boots having done 38,000 miles, and they aren't anywhere near the wear bars. It also weighs almost exactly the same as a diesel X5