Don't be stupid. I'm sure you'll be able to disable the beastly looking thing on the right side of the screen. In fact, I bet you'll be able to move it all over the place, and perhaps un-dock it as it shows in this image:
Un-dockable clock (while magnified)Also, it seems for those that are hard of vision, you'll be able to magnify the clock as well, meaning i'm sure you'll be able to make it smaller. Or better yet, kill the thing all together.
As far as "hogging memory" goes, running a clock -hardly- takes any memory.
Don't get me wrong, it will have its downsides, but you can at least come up with a few useful ones that microsoft's return customers will actually view as a downside.