Not sure them being american has anything to do with their scheduling choice though, I actually agree with you on the relatively excessive nature of the format but then again, I don't have the insight they do, and obviously neither do you. Like, I fail to understand why you would choose to bring nationality into this as it's irrelevant to the subject at hand.
In any case I assume divisions are being put into place now even though they will only have an effect once the teams play from they home stadium.
I also think that if they want to go the division route, rankings within the division itself may be more important than overall ranking when it comes to making the playoffs. I have nothing to corroborate this as I'm just basing it off traditional sports so take it with a grain of salt.
Essentially to make this system work they'd have to play once against teams of the other division and at least twice against teams of their own division, bumping the total number of games per regular season up to 16, from 10. With teams playing 2 games per week and having a week off in between each phase the regular season would last for 16 weeks.
I'm assuming that may be too long for them? Hard to tell but I'd actually prefer that format since it add a bit more meaning to inter division matches and rivalries since you know you'll see them again.