What makes you assume they're just ignoring Linux users all together?
Unreasonable time it takes them to produce a method for offering long term support. The only conclusion that comes to mind - they stopped working on finding such solution, or at least stopped actively working, which equals to dismissing Linux users. I think one year is way more than enough to find a solution for such issue if you actively work on finding one. If you aren't actively working, then no matter how long it takes, you won't find a solution unless someone offers it to you. Lack of feedback doesn't help to make this situation any clearer, and no, it's not something that should be encouraged.
And, to prevent misunderstanding, GOG never said they stopped working on finding such solution. So the lack of communication of any status updates and roadmaps is clearly obvious here.
So because they don't say anything every so often even a "no new developments to report but we are still looking in to it" to offer reassurance automatically means yeah it's never going to happen and not "well we have nothing new to say so were not going to say anything because what would be the point, plus the majority of people who use this site have told us they don't want that" not to mention there is also the whole backlash that can happen since people will start complaining "well why is it taking so long, seriously it shouldn't be so hard to get the ball rolling and start building a decent support base despite having no clue what goes on behind the scenes of your company and how things work there" god only knows I seen more then my fair share of that not only at my job but also in various forums and communities I been in, seriously if say Andrew Spinks who made terraria didn't post a update about 1.2's development every other week people got stupid same with NetherRealm and MK9 everytime a bug or a exploit was found and the devs went silent for awhile, even after saying it's being fixed people would automatically start saying "oh it's not getting fixed, they don't care anymore, yada, yada, duh"
again point is lack of a response does not always mean total abandonment but they have nothing new to report or that they can not say anything on the subject due to decisions from higher ups and when they feel they have something worth reporting they will, can it mean total abandonment yes all I am saying it does not always mean it. In this case no one but GOG knows if they are or aren't any anything you or I say is just pure speculation nothing more and nothing less and it's silly to jump to assumptions and act like that is the facts of the situation when we don't know squat.