I think it's hard to see the change in US toy stories looking at articles (and discussions) like this. There's always been turnover in retail; very few stores and chains last a lifetime. (I've always suspected it has to do with when key people retire or otherwise leave the business.)

Compared to when I was a kid, there's no shortage of toy stores: There's always something at the mall, Target has toys, bookstores have toys that didn't have toys when I was a kid. (My daughter asked me to take her to a bookstore in town last weekend that was about 1/3rd toystore.)

So, it's really hard to "blame" someone for a "demise" that, to me, looks like traditional retail turnover. Even if we didn't have Amazon, I'm sure older retail stores would turn over, and newer retail stores would eat them.