personally think it is kind of a dumb idea. ms has the resources and all they need to do even if they want to keep the shitty aluminum gpu heatsink is to put in talismoon fans and then use RBJTechs shroud divider, put some type of covering over the heatsinks that seal them to the shroud and replace the xclamps.
and as far as the clamps don't put any stress on anything, i have seen a gpu heatsink that was warped - pulled down around the mounting points and the center was higher up, so yes, there is stress on the gpu heatsink which would lead me to believe there is stress on the board as well.
in a better world, they would use copper for the gpu heatsink, but even if they didn't, they could make do w/ the stock piece that is in there.
i still doubt they will ever do anything because then they would be admitting they were wrong and that would probably lead to a 360 recall for a retrofit, so i hope i am wrong, but the shitty cooling is with us unless we fix it ourselves.