Thanks for the read. You open by saying that change is inevitable, and that Blue Note is nothing more than a brand now, both of which I agree with.
Your central question then seems to be: "My concern is less savvy new fans, unlike veterans like myself will be lead to thinking it’s emblematic of what mssrs. Lion and Wolff brought us."
I would think that someone who buys a Roseanne Cash album on Blue Note will either (a) not be familiar with Blue Note; (b) not particularly care that it is on Blue Note; or (c) understand that Blue Note, as you wrote, is nothing nothing more than a corporate imprint. Some people in the middle may legitimately wonder if Cash is trying to do a pseudo-jazz album. In the era of YouTube and audio samples, they can answer that question within minutes if not seconds.
Maybe the best thing would have been to put the brand to bed decades ago, and use it only for reissues, but even then, there would be disagreement about the cutoff date, based on all the Mizell-era albums I used to find in the dollar bin.
My biggest issue with Blue Note is their compilation albums. These will often include recordings that were on Blue Note, Capitol, Liberty, World Pacific, Roulette, and probably others that I am forgetting, and may throw in a couple of more recent tracks that stick out like a sore thumb. Talk about weakening the brand.