Budget-aware folks will buy these second-hand, neophiles will buy new, confident that long term solutions will exist even after "long term support" is over.
Heck, even knowing there's a second-hand market makes me more likely to buy Bose new.
Between that and the good-will they're getting from this move, this is making a ton of life-long Bose fans out of a lot of audio geeks. And if there's a community well-known for creating religions out of their hardware preferences...
The most amusing anti-example of this was the Switch generation: $60 for a cartridge, or $60 for a digital license. Guess which is actually more valuable? Guess which you were more likely to find discounted, even if only by a marginal amount, by some store desperate to move stock out of the way?
By contrast, I'm not worried about the fact I can't resell my copy of Game X I got on Steam when I only paid $5 for it in the first place.