I like the video, but I think Lisa the Boy Scout was the wrong episode to use as the springboard for it, which does make the video fall a bit flat. I'd also say that the mixed reaction here to changing Sarah Wiggum or Brandine recently shows that the idea the remaining fanbase would accept everything isnt necessarily true. That being said, that's just here, I dont really know what people thought of it on say, reddit. And everyone has loved what Boyz in the Highlandz did to Martin and are just waiting for the follow up (to your point.)
While I don't necessarily agree that the show needs to fully embrace some of the wackier introduced concepts from episode's like Lisa the Boy Scout and run with them beyond the confines of a 22-minute episode... I have been actively expressing apathy towards them not adequately following up on what has been sold to us as a "change in the canon" and then consequently dropped without explanation.
Also while I do feel too many format benders could tire people out in theory, Lisa the Boy Scout kind of works off the surprise of seeing it and its conversation directly with the audience, two things My Life as a Vlog didnt have since we knew what it was in the first place. I dont think it would have been as popular in isolation anyways