No, it actually doesn't. In the majority of cases those alleged mainstream and center politics have been right-wing to at best center-right-wing already for decades and they have been bad for as long as most voters can remember. They have not suddenly started abandoning sensible politics or failing people. They are simple continuing the exact same policies of previous decades that fuck over people to make a few rich. It's not the politics that changed but the amount of people getting fucked for policies benefitting only a very small fraction of people. And the fact that they don't need to obfuscate their bad politics anymore as bullshit populism is so much easier and more effective as a diversion.