If you don’t cannibalize yourself, someone else will.
Products constantly hold a tension between stasis and change. In business there is tension between selling what you created to obtain a return on your investment and creating new products to increase future profits. For customers there is tension between the easy reliability of the familiar product that has already been paid for and the thrill of the new and improved product that costs more money.
For designers there is always dissatisfaction with the shortcomings of what we have now, a constant burning desire ...