IMHO, I don’t think that would change anything (with regards to immigrant influence).
EDITFor those downvoting me, I’ll explain it more for you. The vast majority of the world currently uses the metric system. Only three countries officially use the imperial system (UK has mixed usage, including them would bring the number to four.). If the majority of the world uses one system, and the US hasn’t changed, how will migrants influence the country enough to change?