  We introduce the Causal Compatibility Conjecture for the Events, Trees,
Histories (ETH) approach to Quantum Theory (QT) in the semi-classical setting.
We then prove that under the assumptions of the conjecture, points on closed
causal curves are physically indistinguishable in the context of the ETH
approach to QT and thus the conjecture implies a compatibility of the causal
structures even in presence of closed causal curves. As a consequence of this
result there is no observation that could be made by an observer to tell any
two points on a closed causal curve apart. We thus conclude that closed causal
curves have no physical significance in the context of the ETH approach to QT.
This is an indication that time travel will not be possible in a full quantum
theory of gravity and thus forever remain a fantasy.
