That is a very difficult question.
It is observable no other country has the same incredible diversity of options in its post-secondary system. By most measures of value-added outcomes, the US system also does extremely well across most of the system, the notable exception being for-profit colleges.
But could it be even better if we had a more global-standard system? It is virtually impossible to answer a question like that. Indeed, for that even to be possible, we’d also need to overhaul our entire K-12 system, maybe even earlier ages than that.
So I truly do not know the answer to questions like that. But I do know US colleges do not have the power to unilaterally change the entire US education system. They need to compete within it as it is.