Nothing wrong with 1-0 games in principle. Or 0-0 games for that matter. It all depends on the game. High scoring games can be boring as well.

Hurling manages well enough without an offside rule - but then it's possible to have a player score from pretty well anywhere on the field, so it's not a comparable game really.

But the real disadvantage to abolishing the offside rule would be that it would mean an end to the sport of explaining the offside rules to people who don't understand it, and of arguing about it with people who do. I think that pretty definitively rules out any such change.