It doesn't "resolve" BGP attacks. The point is an attacker would have to pull off three or four successful attacks at once, which is harder than pulling off just one, especially if they hope to go unnoticed.
Or of course for smaller targets their attack is just much closer to the target than to any of the multiple viewpoints, and so this mitigation makes no difference to them whatsoever.
We shall see how well this works in practice. Assuming it's relatively cheap it's harmless to at least try.
