A wider choice means that the set of disciplines and subjects is higher. Compared to the past, the set of careers and jobs have increased. Education has to reflect this change and prepare the students appropriately.
Choice along the depth dimension means that one can choose to learn a subject as deeply as desired.
Choice along the length dimension means that one can choose how when and for how long to learn -- including life-long learning.
The 3D expansion of choice is enabled by two things
advancements in information technology (hardware and software)
the accumulation of multimedia content
Thus the supply side of the 3D expansion is available. The demand side is latent and has to be stimulated. In a way, people have to be made aware of the expansion of choice along 3D. That requires some degree of marketing, advertising and selling to the public.
Move from the Formal to the Informal Sector for Education
Think of Education as a service that people buy not just from traditional schools and colleges but from out there in the cloud. This is the informal sector but it can also be called the "modern" as opposed to the "traditional" sector.
The problems one has to solve are often novel to oneself and require learning new things. 3D learning systems make just in time learning practical and effective.
Learning from the crowd
There are hundreds of millions of people who keep solving problems and the set of solutions increases with time. This stock of solutions is potentially accessible and easily searched. One does not have to reinvent these solutions.
Rethinking Schooling at a Massive Scale in India