Massive pixel counts are paving the way for increasingly precise photos that can be magnified and cropped to highlight certain details. At the same time, they also enable users to print pictures in very large formats.
However, let's not forget that a 200-megapixel camera will not necessarily take pictures that have 200 million pixels, at least not all of the time. With the current technology, there is also a trend for combining up to four pixels into one to improve performance in low-light and at night, which would result in photographs of around 50-megapixels.