Aha.
But without the internet, it can be argued that that acronym never would have come into being. Instead, I would have affirmed my agreement with a full utterance: "Right on, bro!" or something like that.
Still, looking at your larger question, I disagree that the internet is spelling the end of "niche knowledge" (one could argue it can't spell at all, given the lack of vowels in things like 'QFMFT' et al

). While the internet is becoming a repository for all knowledge that we've amassed so far as humans, and especially all buffoonery disguised as knowledge that we in our hubris like to pass off as
sagesse, one still has to have at least a small awareness of a knowledge in order to find it on the internet. In other words, one has to at least have a term to enter into a search field.
In many cases, however, I would welcome a bit of "un-niche-ifying," given that one of my passions is linguistics, which seems to baffle everyone. I was cursed with a social nature coupled with a passion for an absolutely specialized passion. Trust me, trying to find people who are excited enough to bother looking up valence change and Oroko verb morphology in the Mbonge dialect, not to mention people who want to bother talking about it, is a difficult and lonely thing.
Yeah, specialized knowledge is alive and well. But what I see happening is that those who traffic in it are better able to find one another, and potentially bring others into their fold.