You didn't even really read what I posted did you lol.
You are going over old ground, but I'll address it anyway.
Two things have changed since NFL Europe (which, BTW, was more successful than many would care to admit, particularly in Germany); firstly the internet has made access to the sport significantly easier, and secondly the NFL have learnt from the arrogance of thinking that they could just plonk down hugely expensive leagues and that people would go mad for it. Basically, their tactics have shifted.
Now instead of trying to push expensive new leagues in what are effectively brand new markets, they are building slowly by trading on the brand awareness of the NFL and big NFL teams to try and get people engaged with the sport through them first, in the hope that a significant number will engage with the NFL directly by subscribing to NFL Gamepass or however else people access the sport depending on the market.
Outside their target markets they don't really care about any growth past that point of getting your money, but that growth will happen, and is happening. Take Australia, or the UK for that matter, as an example, more people are watching and playing American football now than any other time in Australian or UK history, and those numbers are on a steady increase.
I already gave you two examples where the NFL did it without even really trying; they've effectively neutered the CFL, and though Liga MX is doing better than the CFL, they're succumbing as well. There're plenty of other non-NFL related examples as well- soccer in Japan and South Korea, basketball's growth in South America, everything that's happening in Africa and China that's too complex to get into.
This is just the typical, arrogant, baseball is America's favourite pastime BS. It wasn't true of baseball, and it's not true of any other product either. No matter how cemented any product can be outcompeted by new competitors, especially if they become complacent, just like the NRL has been complacent for the last 40ish years and the AFL has slowly but steadily grown in the Northern states, which is another example frankly.
