They cannot see the future, not even intuit the chances of it. Bethesda still makes plenty of sales on Skyrim, if their future products fail, there's always that baseline. Likewise with any other tech company: Their existing products will keep them going for 5 more years, in many cases, so any innovation or product development is a cost to be slashed, not an investment in future profits. So minimizing the cost of them is imperative.