To paraphrase, western democracies have problems, but the other systems are worse. If one accepts that democracy remains our best bet, the question becomes how to make democracy function better. This isn't just a question of what system of government, vote, decision, etc, but also of how well informed the citizenry is, and to what extent they feel empowered to be politically active. Billionaires do have an outsized power to influence in general, and in the US in particular (super PACs, etc), but other powers can act effectively against them (justice, press, NGOs and other forms of organized civic actions..). Switzerland has very frequent votes on a wide array of issues, giving citizens constant opportunities to act on the way their country / district / city operates.