I think at this point major decolonization is unstoppable. Even with the empires in better shape than OTL thus far they have been trying to hold too much and that will lessen their chances with even the colonies they had a better chance to hold. France is fighting to hold Indochina and Churchill is spending political capital trying to preserve the Raj to some extent via dominion status. The French and British will simply have to start choosing what to cut loose or loose it all even quicker. Once the dominoes of independence start falling it will be harder to justify keeping hold, especially if in say the British case they don't quickly fall to communism. A lot will depend on how much self government is given and how quickly. I am guessing the Pan Africanists organizations in the USA were supporting Wallace a good while and likewise have been sullied by association with his downfall. But I expect they will be back when the movement of Civil Rights once more gains momentum.