Maybe the question you should ask is why does the whole game industry, excusing Nintendo, think mature games are the only part of the market that matters. Its these devs that are the problem. So narrow minded that they neglect to notice just how successful Nintendo games are.
“When we make some new announcement and if there is no positive initial reaction from the market, I try to think of it as a good sign because that can be interpreted as people reacting to something groundbreaking. ...if the employees were always minding themselves to do whatever the market is requiring at any moment, and if they were always focusing on something we can sell right now for the short term, it would be very limiting. We are trying to think outside the box.” - Satoru Iwata - This is why corporate multinationals will never truly understand, or risk doing, what Nintendo does.
