It's pretty much ASB by that point.
The Western Empires knew they could'nt hold onto their colonial Empires forever, hell they knew they could'nt hold them for more than another decade (two at the most) without massive reforms, so it ultimately was never by then a question of keeping them or not, it was a question of what can we directly incorporate and how can we give the rest indeepndence without a gian clusterfuck.
Britain (and IIRC France) initially porposed long range plan with the Metropole paying to build up the infrastructure and civil society in the colonies and then granting them independence once they'd achieved stability and the ability to govern and be economically successful, which would have had most of them gainin indepdnence in the period between the late 70's and early 90's and the very last 1 or 2 becoming Independent in the first few years of the new millenium.
Some colonies, primarily the small islands, places with majorities that would support remaining and highly strategic places would have been integrated as full, equal parts of the countries.
However the United States opposed this, demanding that all the colonies become indpendent now, and to hell with the facts that quite a few did'nt have the physical, economic or governing infrastructure in place for it, further exacerbated by the U.S. and Soviets sing the colonies for proxy wars.
So the best you can get is the colonies being built up and gaining independence later as a result and maybe a few more places remaining and beig integrated, but that's basically it.