I don't think anyone said it was a bad idea. Incomplete, ineffective in the long run, fraught with the same problems we already have, sure. But bad? No.
And THIS point is one I vehemently disagree with:
3rd-party developers shouldn't be expected to patch WP's holes. I've heard it before ... "There's a plugin for that" ...
The words 'patch' and 'holes' are incorrect usage, IMO. You're not 'patching' WordPress with this 'fix', nor is it a hole. It's a design choice. And third-party developers should totally take advantage of these choices and come up with fantastic methods to customize, tweak, change, alter and otherwise have a hoot with them :) That's kind of why WordPress works. It allows you to do what you want your way, me to do it my way, and Westi-san to do it his way.
By pointless, I think Westi means that it's just going to put us back exactly where we are today, in a couple years. So why spend all this time and effort with that, when you could do something else. Pointless is a bit harsh, but a valid cautionary usage.