I don't think in the current Apple that Tim Cook is the one that is expected to have the vision for the company going forward. I think this responsibility is partly in the hands of Jon Ive and probably some other higher-ups as well. It's also interesting that Apple will allow employees some time to work on their own projects, perhaps Apple is expecting the employees to develop great new ideas that can be turned into products.
Can we at least wait a "few years" before declaring that Cook's Apple isn't able "to launch revolutionary new projects every few years"?