that completly depends what teams you want to play, imo roshi and han are worth it but if you dont care about them both than i would say keep drawing in kage.
kage ninja wont be worthless just because jinchurike treasures are here, you c*e them just fine
jinchuriki ninjas arent really a improvement of kage ninjas, more like they open up more differen teams with the super tanks roshi and han, the control monsters utakata and fuu, yugito also is kinda interresting with a 20 chakra mystery

well only bc han is available doesnt me*l buff teams are dead, we already have the lvl 80 windmain mystery that clears buffs and that doesnt mean noone plays buff teams

really want Mei, but on the other hand, I dunno if I would use her
let me tell you this in china Mei is still beeing used so is gaara, danzo and darui