Lots of businesses fold due to not having the vision to evolve with the market. As far as the retail hobby industry you can look to now gone Tower/Hobbico and Horizon for a fair share of the downfall of the hobby industry. We the consumers looking to save a dollar here and there rather then supporting the local shops have done some damage as well. The bulk of lost interest is just that, there are far more activities and technology to keep the younger generations occupied with less effort. The “ participation trophy “ generation is just not interested in a hobby that requires effort.