Multilateralism is the exact opposite of what would happen if the US manages to fend off Russia and China. The only way multilateralism can truly emerge is a confrontation between two or more blocks where there is no clear winner and thus big countries need to offer more autonomy to small countries in order to win them over. The US sparking wars to keep poor countries sending raw materials home, leveraging the dollar and nuking from orbit anything that even remotely looks like socialism as they've been doing right up to this point is the worst case scenario, and the global events that are weakening this should go on as much as possible. The best case scenario is that a revolution becomes easier due to instability, and cooperation between socialist powers appears as a new stabilizing force.