Do you remember when Facebook wasn't considered terrible? Twitter? Reddit? Instagram? Snapchat?
This is just the latest one to rise to the top.. following very predictable patterns. It's got something novel (in this case I guess a better algorithm and UX).. an attracts an early community (which largely always seems like the youth rebelling against the current top dog). Then the masses come. Pretty soon.. that original spirit and thing that makes it "better" is taken away by greedy advertisers or "influencers" and the party's basically ruined. And then the next one comes along.
So consider me skeptical of TikTok being any fundamentally different. In another 2-3 years, the next social network will emerge and take over the zeitgeist. Rinse. repeat.