This would have been a great idea, the only issue with this is that the blockchain would seem centralized, cause in a decentralized world or blockchain anyone is free to create any token without any restrictions of not bearing the same name/ticker, i believe the des must have thought of this cause the rate at which scammers are trying to steal money lately is alarming, but there's not much they can do cause adding such restriction will only make their chain seem a bit centralized and not free for everyone.