Will the whole education sector have to change at the same time?
No. UCD can be piloted within a single secondary school, FE college and university. In each case, the learning provider will invite learners to choose a wallet provider from a managed market (i.e. at least two providers), and then use their wallet to interact with both the learning provider and with fellow learners.
Assuming these pilots prove successful, other learning providers will follow; and the new approach will grow to ubiquity, eventually being used for transitions between learning providers, and into employment, as well as internally.