Dark energy observations will not destroy the Universe

There's this preprint by Krauss and Dent getting a lot of discussion that suggests, in a remark at the very end that was of course destined to get a writeup in New Scientist, that our astronomical measurements of dark energy may destroy the universe for arcane quantum reasons. I think it's totally wrong.

The paper starts with an oddity that I learned about back in college, that a system that decays exponentially will (if left completely undisturbed) eventually pass to a realm in which it decays more slowly, via power law. This is generally practically unobservable, but they suggest it may have cosmological relevance if we live in an unstable false vacuum: it interacts in an interesting way with the cosmic inflation induced by dark energy, and this effect could be the only thing keeping us around. But watch out: since observing the system "resets the clock" (the famous quantum Zeno effect), we may have just returned to the exponential realm and thus sealed our doom by measuring the dark energy through supernova observations! Eat of the fruit of the tree of knowledge and you shall die.

Max Tegmark points out the obvious objection, that this isn't really magic--you don't really need a conscious observer with a telescope to cause something like the quantum Zeno effect; all you need is some coupling of other parts of the environment to the relevant operator. Natural processes would have done this for us long ago, if it were so important.

Tegmark is absolutely right, but he doesn't go far enough. Decay of the false vacuum in such a scenario would, as Krauss states, destroy everything in the universe. It therefore follows that there's a great big coupling here--continued survival of anything at all constitutes a null-result "measurement" that the dark energy in our vicinity hasn't decayed yet. It seems to me that this invalidates the paper's whole argument; the undisturbed state evolution that leads to the power-law realm can't happen in a universe populated with stuff. Unless I'm missing something really fundamental.