Instead of looking backward, i will risk to make some predictions to 2020 and you what to take a chance to?

I am new to DA. It's interesting approach. I disagree that DAgilists claim to be the only true project management methodology.
The process life-cycle usually goes through infancy, growth&expansion, general acceptance. In my opinion, Agile is still going through growth phase, mainly because there are so many Agile methodologies. Eventually, they will converge OR as I claim; there will be one 'better' PM methodology for product/service type. For example, hybrid waterfall for construction, while Scrum for small software project, Kanban for small compliance, etc.
There is a saying by Agile sales that 'Everything Agile is great, and everything great is Agile' - should we all jump on bandwagon and replace Agile word with DA?

Andrew -

DA is NOT a PM methodology. It is a toolkit to help organizations improve value realization. DA knowledge could be applied to projects, operations, product development or many other contexts.

It also should not be seen as competing with Scrum, XP, Kanban, SAFe or any other methods or frameworks. One could adopt one or more of those while still aligning with DA principles, roles and lean governance milestones.

I do agree that the certification landscape has got muddier as a result of the acquisition and subsequent plans for new DA-specific certifications but am expecting that this will shakeout over the next year or so.

Kiron