When I was at Summit 2016 I was told in session that there was plans to open this community site to those who were not associated with a Marketo instance at the time aka those between jobs, between consultant gigs and I was told watch this space .... still watching ...
I had a few months between jobs last year and it was annoying that I could not access community in particular for the training materials, job opportunities page and MUG updates.
I also think video (youtube) is the best way to preview and engage with people.
As well as a special newsletter for fans outside the community.
Cheers from Munich