Why physicists doubt a theory of everything is coming soon
September 29, 2026 · 16 min read
A Fermilab physicist explains why unification has stalled, while Sara Walker and Lee Cronin question whether a final theory is even the right goal and argue time or information may be more fundamental. The debate matters because it shapes what the next generation of physics chases.
The rules, numbers and steps worth keeping in front of you.
- Don Lincoln: a theory of everything is generations away, not in his grandchildren's grandchildren's lifetime.
- Lincoln: unification sits at an energy about a quadrillion times beyond today's highest-energy accelerator.
- Lincoln: accelerator energy rises only about sevenfold every 20 years.
- Past unifications: about 200 years from gravity to electromagnetism, then about 100 to the electroweak force.
- Lincoln: extrapolating that far invites surprises; chemistry would never have predicted nuclear physics.
- Lincoln loves string theory but does not believe it, and is pretty sure it is wrong.
- Lincoln's creed: ideas are cheap and measurements are king; follow the anomalies.
- Lincoln's realistic goal: measurements 10 to 100 times better within a generation.
- Sara Walker: there may be no ground to reality; fundamental particles mark the limit of our instruments.
- Walker: the frontier of new physics is life and intelligence, and time must be treated as fundamental.
- Walker: computation is our best current language, not the base of reality.
- Lee Cronin: finite objects cannot hold infinite precision, so the future is not contained in initial conditions.
- Cronin: physics' laws underpin life but do not predict its emergence.
- Assembly theory is testable but young and heavily contested.
This is the short form. The full insight has every expert's reasoning, their own words and the sources.