You ask a fair question, I think. Here are some potential short-term implications of black-hole negentropy:

• The far future will most likely not be dominated by an everyone-for-himself type of scenario (like Robin Hanson's Burning the Cosmic Commons. Knowing that, and possibly having a chance to see the far future for yourself, does that affect your short-term goals?
• There is less need to adopt drastic policies to prevent the Burning the Cosmic Commons scenario.
• The universe is capable of supporting much more life than we might intuit, even after seeing calculations like the one in Nick Bostrom's Astronomical Waste, which fail to take into account quadratic negentropy. What are the ethical implications of that? I'm not sure yet, but I'd be surprised if there weren't any.