Longer Viking age ?

What factors would be required to facilitate a POD incorporating a longer Viking age in mediveal hist ? 1 substantial issue of course is the prolonged paganisation of the Norse ppl than in OTL, so that they'd continue to find raiding their southern neighbours appealing. What about agricultural, cultural and demographic considerations ?
 
Here I go again...
GURPS Alternate Earths 2 featured such a world:
Hite, Kenneth, Craig Neumeier, and Michael Schiffer. "Midgard".
Divergence: 860 CE
What if: Vikings burned Constantinople.
Synopsis: In 1412 Norse-descended realms in northern Europe, Russia, and North America are starting a new age of expansion.

Published: In GURPS Alternate Earths II, q.v.
 
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