People generally want to be playing on a server with more players, which is why the default of sorting by players is set. Second preference would be sorting by ping for those who want the best possible connection. I don't believe a random list will help as nobody would want to scroll through hundreds of servers, they'll end up using one of these filters anyway. Being at the bottom hasn't stopped new servers coming and taking over at the top, you just need to get your server out there and promote it.