Maybe a child board could be created where these threads can live and the topic discussed ad naseum? It would be nice to again see more creative and varied content in here.
As you say, people bring it up in almost every thread, thereby derailing it from the intended purpose, so most threads would end up getting moved into the new subforum.
My (more than a little biased) preference would be if people could provide a link to this thread when the topic does arise and direct people there. If we do have to discuss the topic, let's at least do it without the incessant flame war that usually accompanies the debate. We should also aim to change the narrative about the blocksize having to be a whole number, meaning we'd have to at least double it in one clumsy step. This would be far too blunt/crude/reckless/etc. We can (and must) do better.
(and no, the irony isn't lost on me that I've done exactly the thing the OP wanted to avoid )