The capital is already here in that the witnesses are mining and creating the capital for us, everyday more capital in the form of mining is occurring, sure if people start purchasing more steem it will increase the value of steem compared to other currencies. That is what makes this such a great opportunity, it is a win, win for everyone. No matter the capital you win by learning and teaching, exploring, sharing and communicating regardless of the steem produced, in this case the steem is being generated everyday and their is more steem to share with users no matter the additional capital invested. Sort of like the employees for microsoft when it first started everyone received paychecks (or value for input) with shares (like steem) of the company itself. When the value of the shares increased so did the value of the product (or participation) in the creation.