Fair enough. I went and looked at some of the earlier threads, most of which petered out pretty quickly.
For the most part, earlier posters seemed to agree that this would lead to more backwards Europe, with no population drop and resultant labor shortage to shake up the social order and encourage technological innovations. Peasant uprisings and the discovery of the Americas seemed to be topics of interest as well. Some also suggested that given conditions at the time, Europe was due for a plague--if not the Black Death, then something else with similar effects.
I also ran across a couple of interesting tidbits, although I didn't follow up on them: one poster mentioned the death of Joan of England, who was on her way to marry Peter of Castile. Someone else suggested that we could see increased settlement of the Ukraine by Muslims. Do either of these have any foreseeable consequences?
Some questions I did not see discussed:
Are there any regions that might have benefited from the greater population?
Again, what are the effects on China and the Middle East? How will the medieval universities be affected? (William of Ockham died of the plague in 1348; what might he and his colleagues have accomplished?)
How would the continuing Little Ice Age affect an unplagued Europe?
What alternate pressures might have influenced feudal society?
Does the Hundred Years' War last for a hundred years?
What is green, has wheels, and grows around a house?