“a T-shaped organization is both good at the management of its existing operations, as well as being good at the strategy and innovation needed for a healthy future.”
Some might say that this just describes a ‘viable’ organisation.
Being more practical about it, Gordon Moore’s Escape Velocity would be a good modern read.
I thought T refers to overgrown top management and a long tail of managers managing other managers. And one guy at the bottom doing all the typing.