By 2025 probably the majority of new cars in Europe will be electric and by 2027 >80%. After that the share of electric cars in the fleet will increase by about 4-6% every year. Almost complete electrification will probably take until 2040.

If robotic cars take off and people stop owning cars in larger numbers, things might be faster. Also old combustion cars might still exist, but these are often cars that are not moving a lot.