Your idea of a Eurasia superpower is funny though
Not for Poland it isn't. Because, apart from relegating the US to secondary status, it would also - as a sad side effect - mean the end of Poland as we know it. The beloved Russian prophet, Dugin, has stated clearly that there is no place for Poland between Germany and Russia, so for us the Eurasia form Lisbon to Vladivostok would mean dissolving into eastern or western part of it (or, like during partitions, both).
the US would simply switch gears and take over Africa or South America
Africa? China is already there, and they are there to stay. South America? Sure, that's exactly what I meant by regional superpower: still capable of "shocking and awing" the likes of Uruguay or Peru, but no longer a global player.
Does the EU want to get rid of the US or NATO to partner with Russia?
Not at the moment. Russia ruined all that with this idiotic war. But is the idea unlikely to resurface some time in the future? Who knows?
The USA might have problems with poverty and homelessness, I don't deny, but those problems will only increase if America ceases to be the only global superpower, which would also mean the end of US dollar as a global reserve currency and a disaster for American economy. The amount of Earth's resources consumed by Americans is staggering - if an average Chinese consumed as much as an average American, we would need three additional planets like ours to upkeep this sort of consumption. Unfortunately, we only have one planet. Do you think the Chinese/Russians/Hindu/Brasilians etc. etc. like this disproportionate depleting of Earth's resources? So, the USA better upkeeps its global superpower status or the real poverty/homelesness looms on the horizon for many more Americans.