This. Obito wouldn't have turned evil. He probably would have returned to the village upon seeing Rin and Kakashi alive. Akatsuki would not have been evil. The nine tailed fox attack wouldn't have happened. Naruto would not be a jinchuuriki. Minato and Kushina would be alive. The village would not have accused the Uchiha of setting the fox free. The Uchiha massacre never happens. Itachi doesn't go rogue. Sasuke doesn't leave the village. Sasuke doesn't have EMS, and he doesn't have hatred as a drive to improve. Sakura and Ino and Sasuke's fan following don't find him cool (he hasn't been training to be the best.) They probably find someone else to stalk. My guess is Shikamaru. Naruto doesn't want to be hokage (he's already acknowledged.) The 4th ninja war doesn't happen. The villages are not united against a common enemy. Fighting between villages continues. Jiraiya doesn't die. Konan doesn't die. Nagato doesn't have rinnegan. Basically, the whole series falls apart if Rin doesn't die.