What would be needed to achieve the total EV goal would be a nationalised, (paid by Central government, from our tax's) system of power generation and charging points. That is not going to happen is it?
Imagine, at the next general election a political party manifesto calls for tax increases to pay for massive investment to support the move to electric vehicles. Good luck with that. It certainly is not going to be the incumbents.
Government are whistling with their hands behind their backs, hoping for an easy answer.
If such an investment were available, timescales would be far longer than 8 years, (how long does it take to bring a nuclear power station online?). I predict that unless hydrogen or some other magic fuel becomes available, conventional vehicles will be around for 20 years at least.