They are either the silicon-drenched saviors of books, newspapers and magazines, or yet one more reason for deep-pocketed early technology adopters to spend money. The subject is e-book readers, and the introduction this week of Amazon’s new larger-screen Kindle DX is just the latest option in this rapidly expanding consumer electronics segment. However, the current economic crisis in publishing — especially among newspapers and magazines — has many in that industry trying to read the growth in the segment as a possible happy ending for their businesses.