According to an article at DigiTimes, the demand for DVD burners is likely to exceed 100 million units this year.
Continual price drops for 16x DVD Dual burners have sped up the replacement of Combo drives with the global demand for all types of DVD burners this year is likely to exceed 100 million units, according to Taiwanese makers of optical disc drives (ODDs).

OEM prices of 16x DVD Dual burners currently are at US$30-32, only US$5 higher than those for Combo drives, according to the makers. As a result, the proportion of DVD burner shipments to global ODD shipments surpassed that of Combo drives beginning this quarter, the makers indicated, adding that the global shipment volume of DVD burners in 2005 is estimated to be 78-83 million units.
If you want to read the entire article, head on over to DigiTimes.