On what basis do you believe that it will meaningfully reduce the dollars lost or persons harmed by fraud, as opposed to simple shuffling around the exact means used?

Well maybe nothing ultimately changes. Maybe we end up in a world where Android users have to wait 24 hours to change a setting so that their devices will install any apps they want, from then on with no further delays. But this seems to me like a relatively low cost for a potentially huge benefit for victims.