If Pocket can't make the numbers work to justify updating other non-fiction reference books like the Encyclopedia or the Chronology, I find it unlikely that they could make the numbers work on an updated and expanded Voyages.
With all the talent out there, some fan should be able to make a site for collecting update pages. Ideally, these would look exactly like/be formatted exactly like the pages in the book. Authors would submit the info, the person in charge would format it and every year release a PDF update. When printed the PDF would be the same size as the pages in VoI. Ta-da! Free updates that you can slip into the back of the actual book.