Don't think so. The biggest problem facing us is because we're so sparsed out, it's become a lot harder for our people to marry from each other, and anyone who marries from outside (non-mandaean) is no longer considered Mandaean. A lot of Mandaeans in Europe have to marry from outside so our numbers have been decreasing - I think one solution would be for our religion to start accepting people from outside to become Mandaean (this is hard, our religion is immutable and doesn't accept such change) or the other solution for all of us to be together in one region (before most mandaeans were in either Iraq or Iran)
The Samaritans have started accepting marriages with Jews and the resulting children, and that's a pretty recent development. No idea how Mandaeans to find a way around their scriptures though, but I don't think the leaders can insist on an interpretation of their scriptures that mandates extinction.