So long as there is a price sensitive market there will be sensors other than FF for DSLRs.
If you read the blog entry in full (including the PDF), you'll note that the price differential between a FF sensor and a crop sensor should be quite small. Less than 10% of the price of a $1500 camera.
Why would you pay $1350 for a crop sensor camera when a FF sensor is $1500? (for example)