I’ll bet that any TOS fans who were furious at the time probably did not go on to like the show.

As a TOS fan who wasn’t too happy with what I had heard before TNG came out, I would bet against you. Most of them probably became TNG fans eventually, because the most impactful thing a show can do is simply to be great. Canon complaints are mostly about nostalgia, and if the show is compelling (especially if it’s compelling in a similar way to the old show), nostalgia can’t compete. If anything I’d guess that the people in this article were more likely to become fans of TNG, because it would have exceeded their expectations, which can make things seem better than they would otherwise.