Olivier:
Two points.
1. I don't think anyone (myself included) is suggesting a shareholder model per se. Indeed, a US non-profit generally cannot have shareholders. The "membership" model comes squarely out of the non-profit world. The commonality between the two is that the Board in each instance can be made accountable to that body in a way that no other body can possess. The references to shareholders are merely an analogy, and reading any leaning toward a for profit model is entirely a mis-reading.
2. As to whether US corporate accountability is "seriously dented" outside the US, I don't know (though it seems rather overheated to me). However, I think you are again reading too much into things. The examples given would work just about as well with French corporations or Japanese corporations or Australian corporations. It would be ludicrous and extremely unhelpful to say that we have nothing to learn from US corporate governance or the governance of "for profit" corporations generally, or that we must ignore all the work in that area. We can't be so allergic on principle to these things, and I doubt that most of us are.
(I would also note that that in David Conrad's "parade of horribles," there were companies from Japan, India, Italy and the Dominican Republic in addition to the US, so making this a US issue is both unfair and inaccurate.)
Greg