That's just wrong. I love LMB. Another reason brick and mortar bookstores are gonna go extinct. Probably in the next 5 years.
No they won't. What will happen is the better stores will survive, esp the independents.
In San Francisco, we have
Borderlands Books. All SF/F; they have everything; if they don't have it, they'll get it. The staff is so knowledgeable that if you can't remember the title and author of the book you want, but can describe what it's about, they can usually come up with the answer. They have author readings. They do events.
They have a large dedicated group of customers who always buy their books there even if the same books are discounted on line or at a chain somewhere.
Of course, SF is not a normal American city.