Boxing did damage to itself for many many years. It's doing better because as a whole it's realized that it's fucked up and are taking steps to remedy that. But this new era of combat sport fandom is being hoarded by MMA. You can see many many new fans come in of all ages to watch MMA. It's easier to follow and it's easier to get into.
Boxing is in the middle of a comeback, but I'm not ready to pronounce like the famous boxing illustrated headline that "BOXING IS HOT AGAIN!"
There was a time when everyone, fan or non-fan knew who the heavyweight champion of the world was. When that happens again then I'll put boxing on the pedestal it once was. But for now it's enjoying a resurgence. Whether it capitalizes on that only time will tell.