Since it was standardized by ITU, it's still used in newer telecom protocols, and it's pervasively used throughout higher level cryptography-related protocols/standards, CAdES is one of the more recent ones and gaining acceptance in the EU. Seems like we have to live with it for a while...
It is being used in much more than just telecom and cryptography. Even the UPU use it for tracking packages that get shipped. Take a look at Space Link Extension (for space communications) that uses ASN.1 also.
