I think having the ability to watch a short playback of the stream you hover would be an efficient way to help people watch content that they want to see instead of going through stream and guessing on what is going on in the live stream at the current moment, (getting baited from a thumbnail picture.) It might help people with low viewer count get more attention because people don't need to waste time to click on the live stream. It might be a good idea to test out a beta version to see if the idea is successful before permanently implementing the hover feature for the future.