Where this would be really transformative is if anyone could submit a video and have it verified. If they set up their own slo-mo capture they could just as easily record a sped-up screen capture.
There's definitely a way out by requiring that the tests are reproducible in a 'lab', but that throws out results from machines the lab doesn't have access to
It’s tempting to create a YouTube channel dedicated to showing input latencies for common tasks. Question is: how do you make sure no one is cheating?