I think a lot of people go into bookstores to physically hold a book, look through the Table of Contents, and maybe read the first chapter. This is something some people have to do before buying the book online.
I think a better question is.... Are bookstores (not books) becoming obsolete? Back in the 80s, in southern California, we had LOADS of bookstores (B. Dalton, Waldenbooks, Barnes & Noble, Borders, other). Today, B&N acquired all the aforementioned, excluding Borders; they only bought their client list in the liquidation of Borders. Sadly, this is how B&N must compete against Amazon.
Bezos, owner of Amazon, is the second wealthiest man alive. He'll soon pass Bill Gates. I think the last Forbes list had Bezos at $81.5 billion; Bill, $89.5 billion. If you load
Relentless.com, it links to Amazon.com. Bezos had his Amazon store originally planned for relentless.com (friends/investors asked him not to be too obvious about his goals).
Books will never go obsolete. Bookstores? I do not know.