If Joker's idea was to become a reality, then only accounts who have maxed their Dojutsu KG's should also be permitted to reset into Sage Arts at the cost of their own. Say Joker wanted to reset into the Rinnegan, he'd have to forfeit his Sharingan in order to do so, as while the two are placed in different categories, they're both originally Dojutsu's. That's of course to say if Neji would permit the idea, which in my eyes would be highly unlikely.
Edit: But then again, what of the Grand Kage's and the Daiymo's, surely they'd want to try out the new KG's, and if those with resets are permitted to do so whilst keeping some of their already-existing ones, then surely those with over 80DKs should retain the amount they had prior to the reset once 320DK's is subtracted from their total amount. See if we have it some other way then somebody else'll just complain and complicate matters further, and then the coders would become confused and then there'll be now new KG's for anybody to enjoy. Just be happy with what you have, is all I'm trying to say.