I just thought everything you said was reasonable except these 3 things.
The 15" still has the faster fw800 and the 17" mbp now offers Matte for the professionals especially with the 1920x1200 resolution needed to do better color work.
The 15" has the Agere FW-chipset rendering it useless for audio production. The Expresscard slot doesn't work properly with FW adaptors, even if said adaptors use the TI chipset. So, in reality, it is not even close to an option.
The 17 incher will most likely have the same problems, plus on that super-sized computer (I REALLY don't want a 17incher) they have removed the possiblity of bringing along an extra battery *which makes it impossible from the get-go. The thing is, one thing I have learned from using recorders et al in the field is "always bring extra batteries". This is impossible with that one.
On the rest, they have gone glossy. And if you think about, yes, there is an option to get the 17" in matte, but until yesterday, it came in matte. They are moving towards all-glossy as they have done on the rest of their line-up.
But what removal of features in hardware and os are you speaking of though..? I came from a powerbook g4 1.67ghz 17" not too long ago and to me seems like both hardware and OS seems to be improving with more features.
Removal of firewire, switching to a chipset so the remaining FW connectors are practically unuseable, nixing one out of two FW connectors, removing the choice of matte (don't say I can get the 17 incher I do not want a 17 inch "laptop"), removal of modem, and so on.
OS-wise, even something as simple as having your phone connected via bluetooth and receive and send sms via Address Book (they popped up on screen when one was received) was removed in Leopard. It worked splendidly in Tiger.
Under OS X, although at times buggy, it used to be tat I could use an expresscard adaptor to connect a fw-device. This I cannot do anymore, unless I log into Windows. Not even under Tiger which wasn't like that. A year and a half ago or so, this at least worked in Tiger, but not anymore.
Oh, I didn't mention the MBA, as basically every god damn feature is nonexistant on that oversized and keyboarded PDA. Likewise with the iPhone and how it ties into the iTunes Store.