I expect Bootstrap will live on for a long time, but the era of it being either the trendy or obvious choice is over. When Bootstrap debuted, its big strength

I expect Bootstrap will live on for a long time, but the era of it being either the trendy or obvious choice is over. When Bootstrap debuted, its big strength was that it gave you a decent UI for little effort, at a time when the popular alternative was `vim styles.css`. Needs and tools have shifted. Fewer projects get their UI from a programmer with no design sense. More projects need more widgets that aren't available off-the-shelf. Component-based web frameworks make it easier to build reusable widgets in-house. (I think in didn't help that it took Bootstrap forever to stop depending on jQuery, and SPAs got popular and didn't need jQuery but did need to reduce page weight)