Immigration from Latin America and Asia are certainly helping SI in the US. However, there is a loooooong way ahead... And forget about Celsius, this one is nowhere to be seen.
As a European I find Fahrenheit kind of makes sense on a human scale as 0 and 100 are the upper and lower limits of it being reasonable to be outside. Below 0 is "too cold", above 100 is "too warm" and when it is 50 it is neither warm or cold.