Madara aint facing Naruto.
Even though Naruto becomes incredibly strong to an extent he could take on madara with ease(which is inevitable)....
Just wanna say Madara won't face of against Naruto.Madara is sasuke's opponent in this war,because its all about sasuke quenching the hatred that's being lurking in the uchiha clan for ages,and Madara is an epitome of that hatred.
Another reason is because Minato sealed kurama in Naruto for the sole purpose of defeating obito(Minato is such a genious)and that plan is still working out till this moment.
The uchiha hatred is a thing of the family,and it is better left within the family,which makes me believe he will fight Madara.though the odd might be unlikely,but sasuke will persevere and win!!!