http://enduro21.com/index.php/extreme/2847-usa-gets-an-extreme-enduro-championship-for-2018
I see the USA has announced an extreme series (World Series? Lol) so it may be a possibility in the near future. For now it means more aftermarket protection being developed (and a lot more part sales).
I know that even though the spectator value of the hard Enduro series is huge, the cost of getting to international events (especially the 5 main events) is high and unless there is a gg dealer in that country it may be higher for gg as they would have to ship the Bike as well (most pros just travel with their suspension ... and if you are semi pro like Chris birch you would travel in your mx boots to save weight for the suspension)