Just because your brand is relevant today, doesn't guarantee it will matter to people tomorrow.
Technologies change. Tastes change. Your competitors change. If you don't adapt your brand to keep up with the changes, it will die.
Indy racing thrived as a series where manufacturers proved the durability of their products by pushing them hard for 500 miles. But now that even the cheapest cars are expected to run for 100,000 miles with barely a tune up, the series has little relevance to everyday drivers and the stands are empty.
People may love you today, but don't get too comfortable. Someone or something will come along soon and that easy chair you're sitting in will become a hot seat.