I think you're probably right - before long the pandemic will just be endemic.Booster upon booster. You and I mean the plural will contract the virus as this is not going away. It will be the same as the flu.
I predict that within a month, February at the latest, you won't see "booster" anymore. Instead it will just be the "third dose." The thing about novel viruses is we don't know anything about them, so initial conclusions are likely to be wrong. There were a lot of issues in the overall response to the pandemic, both here and globally. The biggest blunder, I think, is the poor handling of information and communication. The political environment certainly fed into that, amplifying any mistake far beyond reality.
It wasn't known if it was airborne, so no need to start a panic rush for PPE when healthcare workers need it for sure. Then it was established as airborne and we had enough PPE flowing so mask guidance was changed. Vaccines typically reduce the viral load significantly, so that was the expectation here. Didn't turn out to be the case, because this virus has some tricks up its sleeve, so the guidance has changed. It wasn't known how long vaccine or infectious immunity would last, so they set up the initial doses and had to wait to see how long it lasted. We'll find out in 6-8 months if the booster sticks, and guidance will likely change.
None of this is any great failing on science's part. In fact, it's exactly what's supposed to happen. The vaccine doesn't prevent all spread, and doesn't prevent all infections, but it does nearly eliminate the chance you die or get severely ill, which adds up "worth it" in my book.