Using Sharepoint as a “Idea” Box

My stakeholders want to create a Sharepoint-based suggestion box where employees submit a idea and once it is considered as having merit, a discussion board is set up to allow others to contribute their own ideas etc.

I understand how to set up the form on Sharepoint and route it through the approvals. It’s this second part that I’m not clear on how to do. I’ve never seen a Suggestion box or Idea box set up this way (and not sure it’s an ideal solution!) Any thoughts on the implementation or if there is a better way?