Well, if you write that writer's block is inevitable, then that becomes a self-fulfilling prophecy for many people. Yes, you've mentioned a few good points on how to overcome it, but let me tell everybody that there are people out there, like me, for example, who NEVER had a writer's block. I simply don't know what it is!
One day, I tried to analyze why I don't have writer's block and came to the conclusion that I simply "hate" white paper and white screens. In my, probably subconscious, mind there is something missing. Letters, words, pictures, videos.
Oh well, maybe this helps one or the other writer.