Basically, hybrid cars are good for the environment. They can switch to battery power. So you can drive more miles to the gallon and it lowers the greenhouse gas emissions. Currently, hybrid vehicles are more popular in US, Japan and and Europe. However, research has found that these vehicles provide a significantly greater environmental benefits in cities, where driving involves a lot of accelerating and braking. This includes cities in India and China. These results will make hybrid vehicles more popular in Asia in the future.
On the other hand, regarding their performance, there are serious technical challenges to be faced, because currently available batteries offer limited range, are expensive and may have a working life of just 5 years. Improvements in battery life and voltage range may boost performance.
With the popularity of hybrid vehicles, there will be improvements in the ways of charging these vehicles. In this case, inductive charging is a particularly interesting technology. (The technology that we use in wireless charging of phones, will be applied to cars) But this may be years away from practical use.