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I hate the 'what if it works' question.
It's a hypothetical question meant to change the course of the argument. What if it works is a nasty curveball, whose only real answer is another question, "what if it doesn't", but it takes the argument to the level of a 10-year old.
If someone asks 'what if it works', they are out of options in the debate. Chances are good, it's because they didn't really have any to begin with.
It reminds me of the Christians who go to see a Richard Dawkins speech and then ask him, incredulously, "What if you're wrong?"