I think your summary misses the mark. The Big Rip was not the most likely outcome before this new evidence. Heat Death has been the expectation/assumption. TL;

I think your summary misses the mark. The Big Rip was not the most likely outcome before this new evidence. Heat Death has been the expectation/assumption. TL;DR of TFA: New evidence shows that dark energy may be weakening over time instead of staying constant, which could lead to a Big Crunch. We're eagerly awaiting further evidence.