I’ve gotten a couple e-mails asking if it’s too late to change your site idea. No, it’s not. However, do not expect to walk in on Thursday with an idea you just had on Wednesday night. Your idea needs to reflect the two weeks we’ve spent on the process, which means it needs to include:
1) You need to do the same define & observe stage as last time. That means interviews to refine your idea. Make sure you’re filling an actual need, not a perceived one.
2) Who is the audience/community for this site? Define them clearly and carefully.
3) Ideate on the idea same as before.
If you can’t prove that you’ve done these stages, then you’re a little bit sunk.