I don't think a single person that has read that article has responded with any drastic action, nor do I think anyone will. It's just a curiosity sort of thing rather a serious contender of the billion end-of-the-world scenarios.
Additionally, if anyone bothers to read this through:
Fortunately for any descendants you might leave 2 billion years from now, only a few stars inhabiting the general region of Earth's sun will be affected by the merger, the authors wrote. The researchers predicted that any risk to life on Earth is "very unlikely" — and, on the brighter side, the Milky Way's brand-new quasar could actually treat future Earthlings to "a spectacular display of cosmic fireworks," according to study coauthor Carlos Frenk, director of the Institute for Computational Cosmology at Durham.