Thanks. Jared Diamond's book Collapse has always puzzled me w/regard to that Viking colony. Your explanation makes much more sense.
What Jared wrote was THE Theory at the time, and he does make some good points, but I'm sure even Dr. Diamond is aware that new testing (not advanced enough when he wrote the book) shows the story is a lot more complicated.
For one thing, Greenland was much more in touch with Europe than it used to be believed, and the "collapse" seems to have taken a longer time than thought; you get people with names like "so and so the Greenlander" in German Universities in the early 1500's and the new excavations in Iceland have shown no sign of a disaster or mass die-off.
The homes look mostly like someone just closed the door and left one-day, which would fit with a number of possible stories; though I think the researcher who is looking into the hunting evidence (including the reception lists of goods imported into Europe on the European side of things) combined with the DNA evidence for graves of all periods showing people ALWAYS had a mixed lifestyle; is probably on to something.
There is also a chance that some of them went West; my husband says there are hints in the later "Sagas" (the less well-known ones) of some trading going on with the Native Americans for the entire time as well - mostly for timber, because Greenland just didn't have any and not all the wood found there is driftwood.