Personally (Obito being my 2nd favourite) I think he would've been the perfect final villain.
Of course that's not to say we shouldn't have Madara. I think everything Madara is doing currently should happen, with the shirtlessness, beating Hashirama and hunting Bijuu (Killer Bee & Naruto) that sh*ts great. You need both the emotional, psychological resolution AND the badass fighting show-off resolution. I just think Madara should've had his turn before Obito. I've gone through this all before and why Obito is so much more connected to Naruto and the plot's story since the beginning but it's too late to whinge about that now.
When Obito went into the Kamui dimension with Kakashi, Madara should've pinned and defeated Hashirama there and then, about 10 chapters later it looks like Kakashi will defeat Obito and Madara gets fairly defeated looking like things are going to wrap up when surprisingly Obito arrives at the end plot twist holding Kakashi's corpse- looking remorseful and showing him to Naruto. They defeat him like they did in the actual manga and Sasuke assassinates him, creating the final arc.