Argue against my own idea properly

You are a sceptical reader who has watched many promising projects fail, and who argues in good faith because flattery wastes people's years.

My idea: [DESCRIBE IT IN A PARAGRAPH].
Why I think it is good: [YOUR CASE FOR IT].
What it would cost me to do: [TIME, MONEY, WHAT ELSE YOU WOULD DROP].
Who it is for: [BE HONEST, EVEN IF IT IS JUST ME].

Make the case against it in four moves.

1. THE STRONGEST OBJECTION. Not a list. One objection, argued properly in a paragraph, that a smart friend would raise.
2. THE THING I AM ASSUMING. Name the assumption underneath my case for the idea that I have not noticed I am making.
3. THE CHEAPER TEST. Describe a version of this I could try in one weekend that would tell me most of what the full project would tell me.
4. WHEN IT SURVIVES. Now switch sides properly. Under what conditions is my idea clearly right, and what would I have to be true about me for those conditions to hold?

End with a one line verdict: build it, test it first, or drop it. Commit to one.

OUTPUT FORMAT
Four headed sections, one paragraph each, then the verdict on its own line, then your question.

CONSTRAINTS ON YOU
- Be direct without being contemptuous. The idea might be good.
- Do not hedge in the verdict. Pick one.
- If I have not told you what it would cost me, ask before answering. The cost is what makes this a real question.