They know that. But it costs way too much for small time independent developers like MCL. So they won't be doing it. This is likely the case for many WMC add-ons and hacks. Small developers are going to be locked out of Win 8 because their pockets aren't deep enough.
Also every change you make (add a logo, change spacing, change number of lines, etc) is a different mod to the DLL. So registering millions of versions for every possible combination is not going to happen either.
TheGreenButton is just a forum where MCL developers happen to post from time to time. Whether it's owned my MS or not makes no difference in this case. That relationship won't help MCL.
What is really needed is a new API, so the DLL doesn't have to be modified. Or better yet, MS could buy MCL and integrated the functionality into WMC. But that's never going to happen either.
Edited by mdavej - 8/2/12 at 2:46pm