Alt. Hist. request, Vikings make a go of the "New World"?

[Anomalocaris]

The island of greenland became inadequate, the method of agriculture the norse used is still used today - as in...it's -the- agricultural system used today (they introduced it to western culture in the first place).  The leading edge of later european colonization didn't acculturate at all, nor did their survival ever depend on acculturation.

You're asking why a bunch of late (and post) iron age people didn't revert to stone age hunter gatherers.  That's ludicrous.  Why would they?

Uh, Because reverting to Stone Age mean survival?

A sign of lack of adaptability is rigidity in categorizing thing based on preconceived notions of better and worse in defiance to what allows one to survive and what will make one die.