It sounds like you want to use the Question/Answer section of HubPages to engage in a discussion, a use it is not intended for. Forum threads and hub comments are geared more towards generating and sustaining a discussion with other authors as well as readers.
In response to MickS, the goal of Q&A was always to inspire authors to create more hubs. This section of the site was previously "requests," where people could suggest hub topics for other authors. If a person has enough material and interest to respond three times to a question, that is probably a great start for a hub.
If you have a compelling argument for why Q&A should be expanded, please don't hesitate to contact us with your suggestions. We hold regular meetings where we discuss and debate the merits and feasibility of user suggested features and modifications. Respecting the perspective of the end user is crucial in building/maintaining a successful website.