Well I think we can be sure that in the future there will be studies and statistics that:
o EMF (electromagnet fields) and other radiations from electric vehicle do harm
Very unlikely the anti phone brigade had been trying to prove that since the early 90s.
There is some circumstantial evidence of people who live under very high voltage power lines getting illnesses, but I am not sure if those illnesses are any more prevalent than the rest of the population
o Quieter electric vehicles cause more pedestrian casualties
I think this is going to happen, or at least cars will have to emit some sort of noise at lower speeds while maneuvering to prevent people getting knocked down. I'm going to further suggest this is going to effect older people more than younger people.
Electric cars do emit (to me at least) a very audible high pitched electric hum especially when moving slowly in car parks, however I know my parents no in their 70's cannot hear it.
Many times I have watched younger people stop and wait for an electric car that an older person has seemingly not noticed.
o Eletectic vehicles result in more technician deaths (electrocution)
Again I think this will happen, whether it will cause a massive increase in death I am not sure but definitely a lot more injuries and burns.
Interesting one about the electrocution risk isn't it? Might be worth knowing, percentage wise, how many properly trained domestic electricians are electrocuted every year and comparing that, pro rata, with properly trained vehicle technicians? I'm sure there's going to be deaths among the DIY car guys once electric cars get old enough to be cheap enough for people to buy them who can't afford the workshop labour rates and try to "fix" it themselves.
Deaths through electrocution are surprisingly low in the UK, some data I found on office of national statistics suggest somewhere in the region of about 21-22 a year (based on data from 2001 - 2017.
My father in law owns an electrical contractors in Yorkshire, I worked 10 years as an electrical engineer for companies like FLUKE Electric shocks happen very frequently , but most go unreported as they don't do any harm at all. Electricians love sharing stories on how they have had their worst shock or the biggest bang they have witnessed, the most impressive story I heard was one of my old lecturers who was involved as an apprentice in the building of magnox nuclear power stations.
In my days at FLUKE we had one piece of calibration equipment we made, that contained a voltage multiplier to calibrate high voltage test equipment. This multiplier had 1000volts on the painful end and in my time there I took several belts off that device. it would sting for a bit but it had virtually no current behind it so wouldn't kill you.
An electric car battery is going to be relatively safe as its not a grounded circuit, isolated by the rubber tires, if you grab hold of a live wire, you're going to be live yourself but its not going to cause an issue unless you're complete the circuit by connecting yourself to the negative of the car battery. you'd likely be safe to even touch the shell of the car, as it would be a risk if just touching a battery wire and the shell would link you to potentially 700V+ on an electric car battery. I do not think they use the body of the car to ground the battery negative.
The main issues are going to come from people blindly cutting or drilling into high voltage wires. or more likely as the cars get older and some Muppet tries to weld a car without isolating the battery, I think fires will be a much bigger issue than electrocution.