Exactly right imo. It's frustrating to see people treat these few surviving cultures as if they are the only ones worth preserving, as if all the others are a waste of time. I think this results in a lot of resentment.
I think you mistake my point: Iceland's culture _is_ perpetually endangered, more than most. These steps appear necessary for them, they appear to work, and even 100x larger countries whose cultures would survive anyway do some amount of the same.