I think it is plausible that the US would never adopt the changes at all. But I think it's only relatively recently that our refusal to change has actually started costing us significantly in terms of jobs.

If other nations start adopting more flexible education systems that continue to improve beyond the US one, combined with automation cutting even more jobs, it's ALSO plausible to me that eventually US people might be hurting enough to force a change. ESPECIALLY if this global internet based system resulted in "private" school becoming close to free - the schools that unions have power over might not be able to survive without adapting to the new system (if at all)