It is not possible to say what other countries will do but banning petrol/diesel vehicles in my Bangladesh will not be possible at all. We are always plagued by the terrible curse of loadshedding, so if we have to find alternative vehicles to petrol or diesel, there will be pressure on electricity which our country Bangladesh cannot control, as a result mill factories will close down. So it is not at all possible to discover or import any alternative vehicle to petrol in Bangladesh.
Even in developed nations such as the US and EU, less than 10% of the vehicles are electricity-driven. In the third world nations, the proportion is much lower. Given this, even by 2035 I don't think that a large fraction of the vehicles will be EV even in the developed nations. Bangladesh is a relatively poor country, and I am not sure whether the population there can afford the EVs on a grand scale. Current technology hasn't advanced enough to make the prices of EVs on par with gasoline and diesel driven vehicles.