The six warning signs that a novel idea might not pan out

I've worked on a lot of novel ideas that haven't quite panned out, and I've also soldiered through on a lot of bad novel ideas and turned them into bad novels. As a result, I've gone through the "I'm so excited about this novel idea! Oh no now I hate it" cycle many more times than a writer ought to, and as a result I've noticed the six warning signs for…