We are just starting to set up a business on Steem (check our blog for that) and you are adressing exactly the questions we are into at the moment. So what I can offer, is to bring in our perspective setting up a truly SOCIAL network for social impact.
Answering your quetions::

YES, these discussion forums are a good idea and worthwhile.
YES, we'll participate in most of them. Let me know, if it is interesting for you to hear about our business plans.
YES, as a newbie to Steem we'd check what we can offer afterwards to keep the process of creating a decentralized ecosystem moving.

At some point we'd love to discuss the question, how to increase the demand of STEEM in an active way compatible with the business models emerging.