Wealth is one factor but removing the social and cultural context doesn't do any favors. It isn't just wealth that indicates someone's relationship to capital, and in the imperial core even people who make less than a person outside the core have access to certain luxuries and treats and ideological crutches that keep them yoked to imperialism. People are addicted to treats and ideas here that do not plague other places, they have no national identity, they have no relationship with their neighbors and no reason to have them. Of course we can say that all people will benefit from redistribution of wealth, even wealthy people since it will resolve the existential threat they too face from issues like climate change, but it is not enough to explain who will be interested in overthrowing imperialism and why