It took 100 years or more to create the ICE motors, complex gearboxes, plus ubiquitous petrol stations.
Also ICE are more visceral, from the sound to the "driving by the seat of your pants."
You could argue electric cars are as old as petrol cars, but lithium batteries have only been around since 1980. An EV that you can purchase has only been around since 1997.
With any new technology, there will be those that embrace change and those who resist change.
My father was an architect, and loved doing pencil drawings and blue prints. He could never get comfortable using a mouse instead of a pencil, and so retired.
A lot of mechanics will need to upskill, and be hesitant. Given the reduced complexity of EV's, some mechanics will need to find other jobs.
Being an older worker, I understand their pain.