How long did it probably take to train all the employee's in design thinking?

Choices:
A. a day
B. a week
C. Several months or years
D. not enough information
Several months or years
A prospective client sent me a link to this in-depth article on IBM's design thinking revolution, where Phil Gilbert, IBM's General Manager of Design, has hired over 1000 designers into the firm, and pushed for over 8000 of its managers and staff to get 'trained' in design thinking. They have even created specific design centres across the firm, with design offices in most of its key locations, such as the one above. The goal is nothing short of beginning IBM's next phase of transformation, one of many in its 100+ year history.
However, all is not rosy. Despite achieving a monumental success relative to the status quo, 8000 'recognised' design thinkers in a corporation of over 370,000 souls is barely a dent in terms of changing practice. If NoTosh were to effect change in only 2% of the teachers with whom we work, we'd have packed up our bags long ago.
I'm not sure hiring 1000 designers in and of itself is the answer to any organisation trying to instil a different way of viewing the world. Here's why.
Since design thinking really began to be a thing, back in the early 60s, the designer him or herself has consistently been at the centre of the design process. Even though we talk of 'user-centred design', the actual ideation and production of a solution, and in many cases the synthesis and definition of the problem to be solve, too, are all tasks undertaken by skilled 'designers', rather than the people in the organisation who have the scope, brand, or 'permission' to play in that space. Once the designers leave the project, so does the design thinking.
There is a reason d.school sees its executive courses filled with repeat customers and firms like IDEO continue to thrive - they are resolving challenges in specific examples of services or products, but not necessarily transforming the firms and organisations who had the budget and desire to solve a problem in that specific area. Solving a problem costs money. Solving a problem and teaching the client how to do it again and again costs more than just money. That might be the greatest challenge of all.