ASN.1 will continue to sit on the sidelines in the FOSS world as long as there's no appealing library and/or compiler to make it the easy choice for people. Indeed, using ASN.1 in a new proprietary product or protocol is a very good way to keep FOSS competition at bay.
You mean, except for widely-deployed protocols like PKIX, Kerberos, SNMP, and LDAP, all of which have multiple open-source implementations.
-- Jeffrey T. Hutzelman (N3NHS) <jhutz+%cmu.edu@localhost> Carnegie Mellon University - Pittsburgh, PA