The economics for Amex are very different between Canada and the US, so I wouldn’t necessarily take this as an indicator of anything coming to the US market.
It’s also very telling re the difference between the two markets, that the spend threshold for unlimited access will be just CAD 20,000 vs the USD 75,000 spend threshold in the US for CL guests and unlimited SkyClub access.
I’m not sure how reliable this source is, but it suggests that U.S. interchange rates have a wider range than in Canada, and that is especially important when we’re talking about the premium cards like Amex Plat:
https://www.clearlypayments.com/blog...-for-payments/