I've been in love with libraries my entire life and I think 15 years is a bit short, but I suspect that libraries, as we know them (as opposed to rare manuscript museums) are an artifact of the past. When it comes to old books, Gutenberg has more books than any but the largest library. Sure libraries can lend out eBooks but why have a brick and mortar place to handle that. As for the Wi-Fi connections and meeting places, you can get Wi-Fi at McDonnalds now, and you can meet at neighborhood community centers.
As a child, for me the library was an escape. For many of today's young people, their Nintendos or X-Boxes are their escapes.
I'm voting for 30-60 but wouldn't be surprised if it turned out to be 15-30.
My heart votes for 'greater than 150 years' but I don't really believe it.
Rob Preece
Publisher,
www.BooksForABuck.com