The ultimate demise of the single-core desktop chip from AMD will have to be postponed for a little while longer. AMD is still phasing out chips such as the Sempron LE-1150, but they're actually planning a higher-frequency replacement part called the LE-1660. Intel is currently in the process of phasing out all single-core CPUs from their desktop lineup, which could provide AMD with a little breathing room at the ultra-low end of the spectrum.
Sadly the LE-1150 isn't the only CPU we'll be saying goodbye to soon:
“In addition to the Athlon 64 X2 6400+, 6000+ and 5600+, the company has also informed customers that final orders for its Athlon 64 X2 4200+ will be taken at the end of this month.”
We're looking forward to the day when even Celerons and Semprons are all packing at least 4-cores. Given the speed at which the industry is moving, there's no telling when that day will come.