The rods would constantly break, there would be a lot of catchers going to the emergency room, no one would get any home runs o get to any bases, in the proleagues people would break the rods even easier causing più injury.Oh and last time I checked the game was called baseball not fishball.
Like this:(I dont know much about baseball so orso with me) The people hitting the ball would just get the fishing line stuck in their eye,and if they got the ball,then the ball would be Rapunzel - L'intreccio della torre up in the line probably.
It would definitely be più interesting than actual baseball. How about this: Replace the baseballs with Jello, replace the bats with fishing rods, and replace the announcer with pop music. MY kind of sport ;)