if obito does indeed become "good" then the bijuu's have to be taken away from him mainly because i don't see madara having the ability to even touch him in his current form. That would make for bad writing.
I believe that the bijuu will enter naruto. Madara will then eat the forbidden fruit.
Final fight :
Rikudo naruto + sasuke vs rikudo madara.
agreed bro as madaras anticipate you anticipate that obito will failed.... (back then obito was chosen to be successor/continuation of plan by master-mind madara obito alone is stupid!!!! Madara created rikubito because being so69 more or less than 15 mins was a great honor coz he theft it from madara, and still not contended, the fact that madara give his life, his name, training, knowledge,wisdom, intellect, his eyes (rinnegan of madara) and his over-all action my prediction, obito will die, he will pay what he have done on his crimes, and theft the throne from madara! Let his life be the payment by the used of madara's trump card! It is not yet end for the shinju's final form which i see and became self sustain because it is already final form!!!!!!!!! Madara will utilized it and somehow obito will be forced to used rinnetensei and madara will revived!!!!! Then madara eat the forbidden fruit and cast the sharingan then mugen tsukiyomi
all hail madara!!!!!!!!!!!!!!!