Allow me to present this exaggerated scenario.

Let's say people absolutely fell in love with baseballs, and I'm talking about an unnaturally high demand for them.  They simply really want baseballs, and as many as they can get.  Baseballs become a very valued commodity and it became very, very profitable to make them.  Whole industries sprung up to make as many baseballs as they could of many different kinds and people kept on buying and buying them.  It gets to the point where a significant amount of the GDP is based on the production of baseballs, and their value is such that people could store them in a bank and use them as collateral because the demand for these was just that strong.  

Then let's say, that for some reason, people changed their views and baseballs are all of a sudden, simply not demanded as much.  People don't want them, and thus the large multibillion dollar industries which were making them could not sell them.  This would end up leading to large scale bankruptcies and massive job loss not only for those directly in the baseball industry, but also industries that support the baseball industry such as rubber.  So now you have large scale unemployment, meaning that many businesses lose customers, and many people, whose had a lot of assets in baseballs, now find themselves worth a lot less.

What should be done about this?  Should the government spend tons of money to keep the baseball industry propped up so that these massive job are prevented, but at a huge cost of for a good for which there is near no demand for.  Should they be allowed to just fail and have the economy go through a severe contraction (potentially bankrupting many not involved in the baseball industry)?

I'd like to hear your thoughts on the matter (I'm personally still thinking about it).