It's sort of an apples & oranges thing in comparing the two.
Launch sales only depicts a small window of sales, and higher sales during this time period can usually point to there being enough supply to meet most of the pent-up demand of a product. I'd be more interested in seeing what the next year or two shows for console sales to see a more realistic comparison.
End-of-Life sales gives a quick summary, but doesn't tell the entire story. The Wii sold gangbusters through its life, but we all know how miserable the last year was from a console sales standpoint.
Realistically, a business at the beginning of their fiscal year will make sales projections on their product line based on market conditions, historical demand, and surveyed interest in the product. It's more important for the business to meet those yearly goals as a sustainable revenue source than anything.