Well the fact is Danny, the "solution" you're oh-so subtly selling is little thin on game theory.

User selectable blocksize just moves the shouting match directly to the consensus rules, and of course, who shouts loudest wins. No amount of goodwill platitudes can wish that away, so you're going to have to admit you're selling yet another 2nd hand used-Bitcoin eventually

And that's without forgetting that even without the BU blocksize getting set to "datacenter" by bad actors, a majority of BU users aren't going to even set the mysterious "block limit" setting, much less the "Depth" setting, and so BU developers de facto choose it's blocksize anyway, as they choose the default