Even though the "United States gives up on space" narrative is temptingly simple, it's also (in my opinion) simply wrong, and substance-free commentary like this is disappointing. (If you base your opinions on the unsupported statements of old astronauts, you can look at Buzz Aldrin's comments for a different perspective, but I'd recommend doing your own research instead.)
Much of the gloomy commentary on this announcement is uninformed. Canceling the Constellation program is a forward step and an essential step---it makes possible the very dream, bold human spaceflight, that this article mourns. At the very least, read the Augustine Commission's summary report; it's only 12 pages. Note their statement of the goal of space exploration: "human expansion into the solar system". That's cause for excitement, not mourning.