Thank you guys for your interesting thoughts on this. I agree with the statement that the chart shows user interest and nothing more, that's what I said at the beginning. I didn't say anything about Scrum replacing PMI as a project management method - don't forget it's made for product management.
Posted By m_konkel on 19 Dec 2013 08:28 AM
On the other hand, PMI also started promoting it's own certification called "PMI Agile Certified Practitioner (PMI-ACP)" so it also tries to position itself according to current trends. I don't have any knowledge on what the above certification is based though but that's off the topic.
It may be, but now you started: I have asked a trainer who gives PMP prep courses about PMI-ACP and he instantly suggested to try Scrum. I had no more questions.