I think there should be a huge change done to the current system. I think that licenses should be earned by completing multiple challenges like in the original show. They shouldn't be timed either, which'll make it muc less of a luck-based thing. Also, licenses should be sold for much more (probably somewhere in the millions range) but can only be sold once. After all, in the original show, it has been stated that a license can only be obtained once. The only reason Gon got his back is because he bought it again after making enough money.