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kilobug comments on The Fabric of Real Things - Less Wrong
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... assuming a constant or accelerating inflation of the universe.
If the inflation of the universe slows down or stops, it won't be the case anymore. And while it seems currently that the inflation is accelerating, we don't know much about why it is doing so, nor if it'll continue to accelerate or if it'll slows down later on.
Even if the inflation stops or slows down, that's still what "cosmological horizon" means.
This merely implies that if the inflation does stop or slow down, the cosmological horizon will also happen to coincide with "how far a signal could possibly travel until the complete death of the universe / the end of time", for c-bound velocities. If there's an upper bound on the spatial size of the universe, then the cosmological horizon might not exist in reality at this point. If there isn't but it turns out we will never reach maximum entropy, then the cosmological horizon also doesn't exist here.
Fun stuff to think about, IMO.