Networks know its risky to put on unknown boxers in there, and to put A-level athletes in there they would have to top HBO and Showtime budgets, wich makes it a very very expensive and tehrefore risky investment. So, as for championship fights its a little complicated to make it happen, PPV is a selective but lucrative market.why not? Would champion fighters not be willing to be on 'free' TV? Would contracts with HBO and Showtime get in the way? Would networks not be willing to take the chance?
Events like friday night fights would be more likely I think. Whats holding on still is boxing's credibility, anyways, depending on how versus gets its return, you might see a bigger tv trying it, but I dont expect it to happen very soon.