Mexico already meets that pay% threshold so it changes nothing. It just changed from a RVC to a more complicated LVC that is easy to game. And they can fudge the R&D numbers to get a 15% reduction to any standards. And those things don't save us money, they will maybe very slightly increase costs in Mexico which will be passed on to consumers. Mexico also get to exempt 1.6mil vehicles from the rule, well under the 1million they estimate don't already conform to the new rules. Canada and Mexico both get permanent exemption to any national emergency auto tariffs. Its a lot of political bullshit that effectively changes nothing.
Right now the US only supplies 50% of its auto needs and can't hire enough people to boost production. So any massive changes to global production only costs us more money not saves.
Read this if you want a smart breakdown of USMCA's potential effects.
https://www.cargroup.org/wp-content..._briefing_april_2018_public_version-final.pdf