To answer your questions:

1. Wolfram Alpha is really interested in combining data to extract new results, or interesting views. If it is able to extract data from web pages that are machine readable as well as human readable, it will be able to achieve its ends more easily and more reliably. I don’t believe that a Wolfram ignoring machine readable web pages would inhibit its further adoption.

2. I remember giving a talk to a room full of Web 2.0-ers, and they were furious. One reviewer said “the crowd completely disagreed. In hindsight he could not have been more correct” (this remark came after a number of Web 2.0 sites started folding after the economic slowdown). But I see RDFa and similar technologies as a disruptive technology, in the sense of Christensen’s book ‘The innovator’s dilemma’; the changes are inevitable, and any Web 2.0 operator would be better off working out how to migrate their operations to a more open method of operation, lest someone else comes along and eats their lunch.

Thank you for your outstanding presentation.Your view on the possibilities of RFDa and the impact on the web is exciting.It would, like you clearly explained,improve the quality and acces of data and information in a huge way. But afterwards two questions came to my mind:(I don’t know if its possible to answer them)
1.What rol can play a search engine like Wolfram Alpha to implement RFDa as a standard ? Is it supportive or maybe blocking it ?
2. What is the influence of a Web 2.0 lobby (social networks like Facebook) who would be threatned in their current existence if RFDa becomes a standard? (They can’t stop and addaptation would seem to be logic)

Any how I wish you good luck with your work.