GIMP changing its name seems pointless at this point, especially because of where the conversations there led. It would have been smarter for them to argue that "gimp" is a sexual term, and therefore gross, rather than an antiquated ableist term, because the former is more common than the latter usage (which is never used).

Reiser's accomplishments are already out there, there's no need to continue with his name on something he hasn't contributed a patch to in a decade, and there's literally no harm in changing the name of a program like this; it's not a binary decision between "remember the person" and "use their work," plenty of people have their work utilized despite no one knowing their name. I think that's fine.