Define "cauterized boards". I believe there is a possibility that Apple will release a redesign. The current MBP design is 6+ years old, and the MBA is stealing it's thunder.
What kind of "thunder?" The MBP isn't an attention hogging product, it's a workhorse. You buy a MBP for very different reasons than a MBA. The two are not interchangeable. You either want a minimalist, but ultra-lightweight notebook or you can't sacrifice any functionality and you buy a MBP. Anyone who buys the MBA solely because it's cute or sleek, even if it doesn't fit their needs, isn't too bright IMHO.
Moreover, since there are no stats on specific model sales you can't really say the MBA is stealing anything from the MBP with any authority unless you are counting ad runs. Then again it's a brand new product and you would expect that.
As for the current MBP, sure it's similar to the original TiBook, but it has been updated through the years just like the Porsche Carrera. The overall design and shape though are classic and do not need "overhauling." Maybe a little thinner and lighter as technology permits but a whole redo is unnecessary.