I noticed the same thing today. My only question is will these conversations be kept within the community? That's really the main benefit of the community - to learn how issues were addressed in the past, learn best practices, etc. I just hope this doesn't reduce the participation rate in the community.
I think it's mainly to find articles (which might be a bigger issue that Marketo should be/is addressing with the new search), but I agree that I would hope it doesn't decrease participation in the community.