At the moment we (as in the taxpayer) are paying for the purchase, install, running and maintenance of these points. When that subsidy stops, the cost will leap and companies will seek to make active profit with an easy number. Sure, your home costs don't change but then that's not the point I'm trying to make.
I read an article the other day (which, typically, I now cannot find) that said the subsidy was limited to X number of cars, and the massive take up increase on these in the last couple of years meant that the cap would be breached the end of this year. If I've got that wrong, my mistake. Certainly other articles I've now been and found back up your view more than mine. Sure, it won't affect the people paying £50K+ for a car, but then they're being bought in tiny numbers comparatively to the small cars like the Leaf, the Zoe and more importantly the i3, which is what will drive demand.
I've not driven an EV, you're right. However, give me the choice of a 600bhp diesel or a 200bhp petrol and I'm choosing the petrol every time. It's not about power, it's not about acceleration or speed, it's about how the whole package makes you feel when you drive it. I can see how 700bhp would be fun for a week, but I'd want something to hold my attention a bit longer than that. Plus, I like fiddling with cars, so to have something that I cannot modify at all drivetrain wise is a no-go for me personally.
There's a place for the battery stuff, but it's WITH an ICE, not instead of. Let it give me more power or positively affect the drivetrain (like a P1 or LaF) or let it allow me to pootle around in the city on electric bit then open the taps when in the country (like the 918). Even the i8 is a good step forward, but that needed an I6 not an I3 to be appealing to me.