Seagate goes on to say (PDF) that it will always be difficult to justify creating additional fabrication plants to create SSD chips when there's already a hungry market in portable devices like MP3 players. Additionally, SSDs require higher-quality chips, which are difficult to produce and don't exactly provide an incentive for manufacturers.
So, in short, you won't be seeing SSDs outside of high-end notebooks any time soon. The fact you even see them there is something of a miracle. For SSDs to become widespread, manufacturing capacity will have to equal or better demand, and that's unlikely for decades.
Keir Thomas has been writing about computing since the last century, and more recently has written several best-selling books. You can learn more about him at http://keirthomas.com and his Twitter feed is @keirthomas.