I agree that there is nothing better than GPG for the narrow scope of encrypting email. But I think there are very few cases where encrypted email is the most secure way to communicate, in lieu of other forms of encryption.
Encrypted email is almost a marginal usage scenario for GPG compared to other uses. It does everything. It is everywhere.Yes it is big, nobody has to use all of it. Just like C++... oh wait it is unpopular on hacker news bubble too despite being a juggernaut of a language. It will still be relevant long after hacker news will be no more.
