While the spirit of inclusion is important to maintain in the Olympics, this rule does little to achieve that end. No country had more than three competitors in the overall event, so there was no risk that one country would completely dominate the final round. At most, only 12.5% of the 24 final round competitors could have come from one team.
This year, three gymnasts other than Wieber failed to qualify for the finals because they finished behind two teammates, from Russia, Great Britain, and China. Meanwhile, the two gymnasts with the lowest scores who qualified as a result of the rule hailed from Japan and Australia--both of which already had competitors in the final round anyway. Effectively, this means that while the U.S. should have had three competitors in the finals and Australia one, they each ended up with two despite the clearly superior American performance.
The all-around individual women's gymnastics will be an inferior competition because Wieber is excluded. The rule that allowed this to happen should be scrapped. It is not only unnecessary in an event which would regardless include a wide variety of countries, but also decreases the legitimacy of the contest in determining the best female gymnast in the world.