1) Regionality - in the Soviet Union there has never been a "total, all-consuming" mass culture in the United States. This means that the products of culture will be focused primarily on the local viewer.
I'm no expert, but I think there's a fair chance mass culture would eventually arise in a more developed and cosmopolitan Soviet Union. I see the massification of culture in the west as being mostly the result of social and economic factors (high standard of living, urbanisation, etc.) and not so much of preexisting cultural factors. Of course, there's the fact that the whole of the US speaks English as a first language while in the Soviet Union that is not the case, so obvisously the USSR is bound to allways have a greater degree of regionality. However, I also think its fair to say that a victory in the cold war would have cemented an united Soviet identity at the expense of regional ones, so that's one more thing in favour of massification.
Also, there's no way cultural regionality won't be diminished by the internet.
2) Politicization - no comment.
I think it's important that we have an idea of how much cultural freedom governments give their peoples ITTL. Some Soviet victory TLs have the USSR democratize in some form, and that would mean degree of freedom similar to the west, but there also some in which they remain authoritarian.
Anyway, I think a victory in a cold war (which ITTL would be seen as proof of the superiority of the communist system and serve to greatly discredit reactionaries) makes the need to control culture a lot less pronounced. If communism is at least as safe as capitalism is IOTL I think we can take for granted at least a Khrushchev-era level of freedoms.
Cultural consequences of the disintegration of the USA are interesting ...
The United States were a lot more culturally cohesive than the Soviet Union ever was, and they have a long history of federalism. I think it would be very hard to have it desintegrate (you would need an event of truly apocalyptic proportions in order for that to happen).
I think that a united socialist USA is much more likely in the event of a Soviet victory.
The revolution in Western countries can occur with the support of counterculture and new social movements.
There was a
huge cultural rift between the Eastern Bloc and the American New Left. If revolution in America really comes from the hippies, the culture of new socialist america will certainly be very different from that of the Soviet Union.
How do you think how much the mosaic will be spread?
Well, they're pretty. I can totally see them becoming a thing in western Europe, though maybe not so much in America and Britain (it doesn't really fit them).
Now, regarding pop culture, here are the two things that come to my mind:
- As I understand it, early Russian rock drew a lot of influence from soviet-era "bards". I'd imagine music like that becoming internationally popular.
- The eastern bloc had a fairly developed tradition of science-fiction. In the scenario of a soviet victory in the cold war, I could see Stanislaw Lem and the Strugatsky brothers being seen as the most influential writers instead of Heinlein, Azimov and Clarke.
That said, both of these pop culture tendencies are likely to receive a lot of western influence anyway I think...