I agree with the spirit of the article, that boxing is too violent. I think in its current state it oughtn't to be permitted.
I disagree with the article in what it proposes though; I don't think you can expect or trust boxers to bow out of fights when they are losing. They probably won't ever want to, and not because they're worried about letting their fans down - they'd most likely see it as cowardice.
I'm not sure what measures could reasonably be taken to reduce the violence in what is, essentially, a contest of who can injure the other into submission.