Well also bootstrap "died" in the most honorable way possible, it got antiquated by the CSS standard implementing flex and grids (the original specification was based on XUL though and not bootstrap - https://medium.com/@BennyOgidan/history-of-css-grid-and-css-...)
Kind of the same with jquery (although it took quite a lot of new stuff...)
Yeah the Bootstrap story is hardly one of the frontend world changing tastes, it was the standard forever and everything else at the time was copying it. Some key fundamentals of how CSS is written in the 2020s changed quite a bit as did how people wrote HTML (as the author alludes to using smaller component UIs with build systems replaced big HTML files and big CSS files). It was good time for a rethink IMO.
Components UI systems are not going away, even as we move back to static heavy sites and minimizing JS where ever possible.
Kind of the same with jquery (although it took quite a lot of new stuff...)
I feel like Tailwind won't get that