It is more than 11 years that Dmoz.org(ODP) exists. But Dmoz is getting less popular everyday. Reasons:
* Dmoz database is not up2date
* It takes very long time that new sites added & listed
* It is not safe enaugh against missuse/corruption
* Publicity does not know Dmoz and not using
* Social Media / Web 2.0 services are more popular(Facebook, Digg, Reddit, ...)
Dmoz is still useful:
* To download all categories and sites
King(Dmoz) is dead long live the king(Web2 Sites)