The state of Multidimensional and Tabular adoption

SQL Server Analysis Services is a product that does not have its own product code, being sold as part of SQL Server. I think that also Microsoft does not know (and cannot know) the exact number of users. For this reason, it's also more difficult to analyze the effective usage of the two different model types: Multidimensional and Tabular. Thus, only indirect observations are possible: books sold, web page reads, web searches, support calls, consulting engagements, and so on. Accessing to public data is very hard. For example, it's hard to discriminate between MDX and DAX web searches (Google Trends is an interesting tool for this kind of things). In fact, MDX is also the name of a car mode, and DAX is the main German Stock Index. As a book and blog author, I have some data that I can share.