I get what you're saying, he isn't a nobody on youtube, that's for sure. He's lip-synched with Katy Perry etc, I get that.
But how many people go "mate, remember when Keenan killed it miming our anthem? **** turned around for us after that, everyone knew about us" ? In fact, and no disrespect to the boy because he obviously has health issues, but that video is mocked big time, mostly because people are ********s and would rather mock a spastic with a funny way of moving than applaud his energy and outlook.
The gesture was well intended, but I don't think you could quantify much of an outcome from it.