lol dude that shit still breaks from time to time.. and there would be way more constant impact on specific areas considering theres only 8 sides compared to a hockey rink.. those pieces hardly get hit over 10 times a match and get replaced if worn down before the next game. not constant impact for 10+ fights on the same piece.
The only replacement to a cage is for it to be in some kind of pit with the crowd viewing down onto the "pit" . the walls would have to be some kind of thick padding with some sort of give to mimmic the fence but not allow it to be grabbed.
So pretty much it will never happen. They just have to start deducting points faster and more often for infractions