Who said anything about knowing any good alternatives to the current system that could be switched to? If it was that easy, some country would have done it already, and they’d be winning the OECD.
I think the suggestion is rather that we are morally compelled as a society, to invest real effort into inventing something new to replace neoliberal capitalism.
States could, for example, be sponsoring experiments to validate new economic models, through e.g. low-barrier-to-entry applications for charter cities and other autonomous zones, as long as the applicant can show that 1. there is a novel economic model at play, and that 2. the zone is being carefully monitored to collect data for analysis by the Economics department of a major academic institution.