"Popularity" is meaningless. The camera used should be the right one for the given situation. No one of these types is perfect for every purpose.
I agree with you. we always choose cameras for different purpose. But everything has a trend to forward. For example, with the day & night and high resolution technology, cameras with the IR function or high resolution is get more popular in the market. So i want to know in the future which kinds of camera will be the main trend, not only for the style, but also for some new technology, CCD sensor or lens.