I really haven't made up my opinion on the whole topic, but one thing keeps repeating in my mind.. During the last great rise at the end of 2013, the soft block size limit of 250 kB/block of the Core default value was hit, which a majority of pools where using, with Eligius as one of the few exceptions, pushing blocks with 700+ kKB/block, if I recall correctly. This chart illustrates well where I'm getting:



What makes me wonder: the average block size increased significantly since then, but consider another, maybe even more explosive, adoption movement of 5-30x, triggered by some black swan event. What would happen?

I think there is much value of having this discussion, and seemingly crazy proposals, better much sooner than later, to be prepared for that moment.