It seems to me that hybrid cars is a dead end. With the price of batteries even for use in the city, these cars will be too expensive. I think that the situation will not change until not come up with a new type of engine which will be cheap to produce electricity
I suspect we may have to wait too long
If we exclude some marginal ideas like cold fusion of
Andrea Rossi's fame and similar things, there is nothing new which can be invented in the foreseeable future. Basically, we already hit the wall from the engineer's perspective (a few more %% of efficiency won't change anything). This doesn't in the least mean that it is impossible per se (since it is our knowledge that is the only real limit), but when it becomes possible and we finally get there, we may not need any cars any more
We may need to wait for some time. But I am sure that someone will invent a portable source of electricity, just like MeizuNN22 posted. But still, I am not sure whether it is going to be nuclear or non-nuclear. If it is non-nuclear, then it will be much safer and convenient. Even if it is a nuclear device, it will be capable of replacing the gasoline-run cars.