Google already has a messaging solution that handles both text and video chat — it's called Hangouts, and it's become the butt of many a joke about how moribund it has become. After launching with a lot of high-minded promises and ideas about the future of mobile communication, meaningful product development seems to have stalled out. Even so, Allo and Duo are not replacing Hangouts, which makes you wonder: what's next for Hangouts?