Been away for two weeks, so I am late to the party, basically I am going to agree with Slug and then carry it on a different track.
An Individual has an idea for making money, if the idea is a really good one, it will make lots of money , and go right on making money.
Because of this, no other idea is ever considered.
The original idea goes on generating money by inertia. (So far, so good)
After about 80 years of steady income, some young upstart says 'Couldn't you do this instead ?'
The Directors say 'We are not interested in new ideas, we have the original big idea!' So the young upstart goes and starts his own company, and in about three years time the Big Idea is history.
I worked for one company where this happened, and retired from another one where I feel sure it will happen before long!