Whilst not all trips are suitable to be done by modes other than motor vehicles, a little over 50% of all trips are under 5 miles, which for many should be able to cycle if the routes were suitable (I suspect that there'll be lots of replies either covering old, disabled, rural, crossing motorways junctions, etc. it's possible to do road crossing motorway junctions [unlit] by bike, I know I did so for many years).
Whilst it might be possible to do a 5 mile each way journey by bike easily enough, given unlimited time, most people really don't have unlimited time.
A five minute journey in a car becomes 20+ minutes on a bike, 30 (plus waiting contigency) bus and well over an hour on foot.
Try doing your shopping on foot from a shop several miles away.
Youj will either go from spending ten or fifteen minutes in transit to literal hours in transit, and its likely you will have to do the journey more often because of limited carriage capacity.
You could easily be talking multiple hours lost a week.
[And before anyone says "shop closer to home" - that just translates as "get ripped off by small shop owner who will take advantage of the lack of usable competition" - there is a real reason Supermarkets became dominant in the first place]
Commutes that take minutes will take hours, this will substantially degrade the available leisure free time of a large part of society and dramatically reduce their standard of living.
Unfortunately a society as well off as our own requires massive use of motorised transport in order to exist - to do otherwise leads inevitably to a huge reduction in the standard of living of the population. And is often couched by campaigners as implictly something that will be imposed on the lower orders rather than themselves. Either you accept massive car use or devote a significant fraction of industrial output to the construction and maintenance of a saturation public transport system.
A few years ago EV's only saved you about 1/3 of the carbon emissions of that of an ICE, conversely all rail use (so including DMU's and diesel locos) had a per passenger km emission rate comparable to EV's. However currently plug in cars (including plug in hybrids) total 2% of cars, so the average car emissions are a VERY long way off being even close to the average of trains.
We are now at the point that resistive electric heating is lower emissions than natural gas heating. So the emissions from the electricity supply have absolutely cratered.
If you wanted to speed EV rollout (and it is probably the best place to deploy zero carbon electricity in the short term), you would just ban the sale of all new cars that were not electric or the equivalent of a Dacia Sandero or Volkswagen Up!
You would also dramatically subsidise home delivery of goods.