The world was divided into two economic spheres during the Cold War.
The difference now with that China is that though some would say that China is capitalist in name only (and they wouldn't be completely inaccurate) it is part of the WTO and thus part of the global capitalist system to some extent. Consider for a moment that exports account for a greater % of its GDP than does the US.
Arguably China is much more like Japan of the 80s and Korea of the 90s than the soviets of the 50s.
Now, if you look at the parts going into the Comac C919, a huge proportion of the parts are non-Chinese: https://www.scmp.com/business/companies/article/2092656/chin...
Basically the tail, wings, radar cover, fuselage, interior, and assembly is Chinese – everything else is US and EU. (The C929 being co-developed with Russia has a greater percentage of parts home-made – this is exactly how China is ramping up its aircraft carrier development, methodically and incrementally bringing more and more expertise onshore).
Buying the C919 when it hits mass production will be like buying a very familiar but cheaper Airbus or Boeing equivalent. Neither Japan nor Korea nor Russia have ever managed to pull this off.
Who knows what will happen. Time will tell. Looking to the Soviet past is not a good indicator of what is coming down the pike imho.