I was going to answer this question, but I couldn't think of anything to write.
Actually, I have had little to no input on Hubpages recently. I don't know why other than I have been putting the polish on my current book for publication.
Still, I have thought a great deal about it and found myself with large chunks of time on my hands without creating a new Hub.
I have found, however, that to keep self-created writer's block from affecting me as much, I put specific times to write in my Day Planner. With the entries established in my mind in this fashion, I find it much easier to actually sit down and write. My mind focuses on that time I have determined to write and I get in the right frame of mind.
Maybe you should start writing Hubs, even if you think you should include them in a book later.
The writings are yours, you can do with them what you please. I have posted several items from my own book and will soon begin posting parts of my new book.
Maybe the incremental attack can help you trick your mind into thinking that shorter is easier. You can always compile them later, even if it is into a single Hub that you post as a compilation.
Also, while you are browsing Hubpages, look for the Hubs about writer's block. Some of them are very helpful!