I don't think a significant amount of Americans, Europeans, Russians, Chinese, etc genuinely wish the decline of any of the other countries. It's just their leaders that create these situations and force us to pick a side.
Most Americans can't even see past basic propaganda nowadays. There's a severe lack of critical thinking. Everyone points the finger and then can't even inconvenience themselves in the slightest.
Reminder, something like 50% of Americans under the age of 40 get their news primarily from TikTok and other social media. This has destroyed critical thinking and basic understanding of the world. On top of that, young people do not value democracy. Something like 40% of young Americans are willing to sacrifice democracy for various things. There's a whole Radiolab episode about the "erosion of democracy".