Except the whole article was written about the Surface RT, and there are only a handful of first party desktop windows app allowed.
Every other app you ever install will be made brand new to support the new tablet ecosystem which will certainly target processors such as the one on the surface rt.
I think as people begin programming for Windows with an actual RT instance to test on (for example, the Surface), apps will become faster and more efficient. Personally, I haven't seen a problem with this as of yet; but, I haven't used that many apps in the store, just Netflix and MetroTwit, FreshPaint and a couple of others.
Disclosure: MSFT Employee