Like this idea!
Actually, GT is done for the token rewards which can be exchanged for jewels and Rama potions which cannot be won anywhere else. Rama potions can be rewarded from the Hunter's Union quests, but you won't get a large amount quickly and it's a random chance. These jewels and potions are used for world boss raids currently. So, getting rid of GT would get rid of these very important and rare items. GT is also fun, people would not be doing it if they didn't enjoy it. If you don't enjoy pvp or don't do world boss raids, GT might not appeal to you and that is okay. But there is still a substantial player base that does GT and enjoys it.