Sorry Lisa: you’re kinda missing the point, I think. I don’t believe that anyone is under the impression that the member and CP templates are in any way linked, nor that they should be. If I am following this thread correctly, this was simply a request from a member to all other members for revision of the current member templates, to say goodbye to the old purple and white and welcome a new and updated version. The CP has had an overhaul and looks fantastic; I guess it would just be nice for the other purple and white defaults to have a revision, too.
Also, I’m fairly sure that the above guys know that changing the member template doesn’t involve dipping into templates all over the place, though it’s good of you to clear that up. I’d say that suggesting a shared CSS file was just another idea of making those parts of the site match.
To those curious as to why only the CP got a makeover while the other templates stayed the same, it wasn’t the dev’s change per se. You can thank Jesse of 31Three for that (though I believe it’s been fiddled with). If you’d like to see new templates, I’m afraid you’ll have to handle that yourselves. The EE devs seem to be focusing on building an effing awesome program over a really decent one with a nice-looking member template.