so if not hosting, care to speculate how docker is going to make $? Enterprise support / services?

Maybe a premium docker repo (mentioned above), where you pay for ... something?

How about competing directly with quay.io but they link up all the networking pieces for you automatically? a docker sdn! :P

No speculation needed. Quick rundown

1) Paid Support (B2B, B2B2C)

2) Docker Hub Private functionality, on-prem offering

3) Services engagements through a set of SI partners, 10 of which we announced at DockerCon US

Happy to answer more questions along this line.

What do you mean by "B2B2C Paid Support"?

Support to businesses who have Docker as a fundamental part of their product offering which they offer to other businesses or consumers (think services companies - IaaS, PaaS, etc.)