The obvious guess as to why it was discontinued would be sales. Maintaining a large menu of blends is costly unless every one is pulling its weight, so it is likely that not enough pipe smokers had the same attachment to it as greatdane did.
With all the special editions being put out, and premium blends bidding for our buck, a few of the old standbys take the bullet and disappear into the tobacco bin of history.
If enough people complained, it might get a second chance, but it would have to be big numbers of people.
The tobacco business is a business, and the decisions are mostly about cold cash. No sales, no blend.
I recently discovered that along with GPL, C&D, and Esoterica, I really like Lane Limited HGL. Whether my liking will last past the first jar, I don't know, but I look forward to it in my rotation for now.