I am a systems trainer and instructional designer (12 years), and have experience in many industries. The phrase 'Blended learning' gets thrown around a lot, but rarely with the same meaning or context.
https://en.wikipedia.org/wiki/Blended_learning
Clients (private and public sectors) often have an ideal that eLearning solutions can be created and maintained at a similar cost and timeframe to traditional learning solutions. As most teaching professionals and the learned folk doing this course would know, this is not the case!

Considering the first affordance: Ubiquitous Learning (anywhere/anytime). I agree that in some instances technology can help transcend the limitations of space and time.
In my experience, a blended learning approach to systems training would typically include an element of eLearning (this may cover some form of basic or introductory training in the new system). The mojority of the learning however, especially for complex systems training, requires a traditional face to face approach. This enables the learners to interact with the trainer in real time, and go 'off script' to allow them to relate the learning back to their role in the workplace.
The upfront work required to create a seemless eLearning course (including time to test, edit, and capture media) can place pressure on project teams to deliver content within the timeframes. When clients want video with audio, this can add a whole other dimension (and cost) to the scope, particularly if the content needs to be translated to various languages.
In conclusion, relating ubiquitous learning to workplace systems training (my area of expertise), I think we still have some way to go before learners will benifit from a reduction of traditional F2F learning methodoligies. Clients learning a new system (often critical to the operation of their real job), need to be able to play with it (try and break it) in an environment that they know their questions and concerns can be addressed.
An example of systems training using a blended learning approach, would be my last role as a Training Consultant with a global mining software company. We created an eLearning solution for the mine design (CAD) and scheduling software to introduce and familiarise the trainees with software. The trainees would then attend classroom training to learn the more complex aspects od the software. Mining is similar to other industries, engineers need to be proficient in a number of computer systems and they also have set/limited time to attend training courses.