Nagato was already revived in his Prime Form way back when Itachi was still around, and what would be the point in giving Sasuke curse marks back? He has EMS, and now some sort sort of Rinnegan Sharingan combination—what more could he need? It would be about as pointless as when Minato was shown...
It disappoints me how much the Hokage have been downplayed, but if they acted as they did in their exploits of the past, there really wouldn't be much for the main characters to do.
I really hope this happens. It is not too over the top to wish, and I think it helps Minato save face, considering that I still find it hard to believe that he lost kurama to zetsu in the first place. But I have an inkling that the Sage's tools, containing some of Kurama's chakra, will end up...
I think that the first is more likely to occur, but I did enjoy in Road to Ninja when Naruto rode atop Kurama- so I wouldn't mind that happening either.
I was kinda of hoping that the transfer of kurama's other half would be smooth sailing, but perhaps you are right. I was under the impression that Minato already had complete control of the kyuubi's yin half when you consider that he was locked in the reaper death seal with him a decade and a half.