You made me laugh! Cristina was equally, if not even more, unqualified for the presidency and she still served two terms. The pendulum will swing back even harder, Milei's presidency will be a failure as the economic and sociocultural systems in Argentina are not set up to build a country to prosperity in the way of, say, Australia. And Milei won't actually change anything that matters structurally about the government and economy, he will probably just end up axing the benefits that help people survive on a day-to-day basis and claim that his way is working.
People will go back to voting for the "safe" option (Peronism) in a few short years, the Milei experiment will be tried and will fail.
I don't think so. Voters are increasingly and inevitably more global and outward looking. Anachronistic Peronism is dead regardless of how they keep trying to dress it up. The Ks only did so well because of the commodities boom of the noughties. Elitist Macri was not the answer. The overwhelming majority win of Milei has shown that people are so sick of the status quo and desperate for change and even though Milei's presidency will most likely not be a storming success his victory will inspire a new type of politics and culture in Argentina. In the US, Europe et al the old school party politics are also crumbling.