Volkswagen just announced their next generation electric car that will be similar to the normal Golf/Polo and cost under 25k€ (which would be quite normal for an ICE car like this). I would be positive that the cost will go down significantly (and yes even taking into account that batteries might be exchanged to provide a functioning market for used-cars).
For the last 20 years battery cost per kW/h has fallen around 10% average every year. ICE engines have thousands of moving parts driving up the complexity and price, while electric engines have what, 3 moving parts?
It is inevitable that the electric cars will take over, ICE engines just can´t compete on price.