What the East Anglia emails actually show is internal frustration over methods, communication, and how to respond to critics. They don’t prove that decades of independent, reproducible measurements were fabricated.
Science is an adversarial system designed to break consensus when the data doesn't hold. Peer review, replication, competing datasets, and independent labs exist precisely to prevent the kind of self-reinforcing loop you’re describing. A handful of emails about strategy or tone does not overturn thousands of studies confirming warming across oceans, atmosphere, and ice.
Also, scientists do still disagree on the specifics of AGW, constantly in fact. The consensus isn't universal across every detail. The consensus is that's it's happening to some extent. There is no consensus on many of the specifics.