Product canibalization against innovation

Product canibalization is that fear that keep big compnies innovating with new products because with the old products the profit and cost are clear with less uncertainty while innovating include risk and lot of incertitudes.
So many things was planned to be doable so many years before they touch the market. If it’s from someone like me who care? but from big corporations it is not acceptable. Realising innovation is something we should legally impose to corporation why are they keeping all these amazing projects on shelves and keep always their eyes on profit and stock prices.
Innovation as obligation. An innovation score is something interesting for judging companies. I dont know right how to implement it to be a precise measurement.