It couldn’t. Post-war socdem consensus was abandoned, because the rate of profit fell so much, it became unsustainable while preserving capitalism. Now we are at “tearing copper out of the walls” stage anyway.
Corporations would never allow a socdem candidate. Left-wing candidates would be drowned in mud by media and betrayed by their own party like it was with Corbyn. Berniecrats would not be able to win.
TBH, I don’t think “turning Eastern Europe and Russia into an extraction semicolony for the EU” can be considered a good development. Of course, we then had an even worse development.
Europe’s entire economy hinges on American hegemony. EU is literally unable to decouple from the US without completely restructuring its entire economy and political structure.