The SaaSapocalypse Is Real: What Smart Developers Should Build Instead

AI agents are collapsing the build-vs-buy decision that made SaaS valuable. In January 2026, roughly $2 trillion in SaaS market cap evaporated in 30 days. This is not a cycle. It is a structural shift. Here is an honest look at what is happening, which categories are done, and what developers should actually build in a world where agents replace interfaces.