If Nokia's most staunch supporters give up on them where will they turn for grassroots support?
A quick review of the Symbian-Guru's list of complaints does not reveal a simple list of manufacturing problems or even software problems which drove them to abandon ship. It sounds as though Nokia's inability to communicate with one of their most vocal customers is what pushed him over the edge. (And will correspondingly have a significant long-term negative impact on their marketing efforts in the United States.)
Frustration ended the relationship. They asked. They pleaded. Their passion ebbed. They finally gave up.
"Shopper Relationships 101" dictates that a company listen to their customers. Especially if that customer is a blogger with hundreds or thousands of followers.