Remember that just because major publishing is having trouble, that doesn't mean people have stopped reading books. Printed books won't go away, but ebooks won't go away, either.
Before I start a project, I always ask myself the following question. Why is this book worth a year of my life? There needs to be something about the theme, the technique, or the research that makes the time spent on it worthwhile.
Your obligation as writers is to distinguish yourself. … The ultimate result should be a book that you write that no one else could have written.
As much as I like it when a book I'm writing speeds along, the downside can be that an author becomes too eager to finish and rushes the end. The end is even more important than the first page, and rushing can damage it.