Sure this MIGHT have been a possibility but bringing Rin back doesn't solve the issue of the ninja system which was the cause. Obito is trying to change the current ninja system, what good would bringing Rin back actually do towards this goal?
Rin's death is a catalyst for changing Obito, that is all.
What's a 31 year old man gonna do with a 12 year old, he's over her dude.
What's a 31 year old man gonna do with a 12 year old, he's over her dude.