It will be very interesting to see if the Mac Pro replacement uses 2.5" drives.
No way that'd happen. That's just too much of a shark-jumping... What I wouldn't be surprised to see is a narrower design that is wide enough to accommodate 3.5" hard drives and PCIe cards, but that'd be it. That'd complete their design transition from having optical drives to not, while making it much more likely to be able to be rack mounted with either an Apple-made accessory kit or with a third-party kit designed by a brand that likely would've worked closely with Apple on something like that.
No, that's not empirical evidence. That's like saying that you can look at how many repairs a BMW shop does on a given model and extrapolate how failure prone they are across the entire nation. For one thing you'd have to know the total population of BMWs in the service area in question and a lot of other things.
I have to stop you here with the following link:
http://www.merriam-webster.com/dictionary/empirical
Notably: "originating in or based on observation or experience <empirical data>"
and
"relying on experience or observation alone often without due regard for system and theory <an empirical basis for the theory>"
and
"capable of being verified or disproved by observation or experiment <empirical laws>"
all of which apply here. Unless you were meaning to use a word other than "empirical", I'm pretty sure, by definition, my assertions are based ENTIRELY on empirical data.
Also, data on how many iMacs have failed everywhere is neither important nor relevant. When in an area (such as Los Angeles) that has a high density population of Mac owners, and when the majority of machines coming in are iMacs, that seems to be a good indicator. But that being said, I've also worked at an AASP in Santa Cruz, CA in which iMacs were also more common visitors to my shop than any other non-accidental-damage repair (with the exception of the NVIDIA GeForce 8600M GT R.E.P repairs being done on Mid 2007, Early 2008 and Late 2008 [17" only] MacBook Pros). So, I've got a high density area and a low density area and in both cases, the machines were common. No, I don't have data for everywhere, but it would seem highly coincidental that they were by far the most frequent machine to come in while in both cities especially given how different both are from each other in most respects. My data isn't conclusive, but it is absolutely empirical and I make no claims that it is anything but.
The only real source of this data is Apple, as they are the only ones who know how many iMacs of a given configuration were produced and how many had problems either under Apple Care or under factory warranty. Apple knows this because they pay for all repairs.
Actually, this is also false. Apple only has data on in-warranty repairs done by Genius bars and AASPs. They do not have data on machines that failed past the first year with people who didn't have AppleCare or people with machines that are older than four years at locations that stocked parts for those machines (and given the failures that those machines are prone to, most places DO have stocking parts for those machines). If Bob's computers, a non-AASP who just happens to have one tech who got his ACMT on his own accord, decides to repair an iMac with a failure, Apple will have no record of it.
I would not be foolish enough to argue that the iMac is LESS failure prone than a beige box PC, because all-in-ones almost always have slightly lower overall reliability. However, I am skeptical of the claim that the previous generation iMac is the most failure prone that Apple have ever produced.
The generation before it was fairly reliable by comparison, as was the generation before it (white with iSight). The pre-iSight G5s were comparably unreliable due to the bad capacitors on those logic boards and the often faulty GPUs as were the iMac G4s. The Late 2009-Mid 2011 generation really isn't stellar in the reliability department.
Don't forget he is also someone on the internet. For all we know he could be a dishwasher in Topeka KS.
It's funny, when I first read this, I thought you meant the kitchen appliance and I had a good chuckle.
No, sadly, I'm not a dishwasher in Topeka, KS. I feel like my life would be much more interesting (or at least much more pleasant) if I was. I'm a lowly ACMT-certified technician working at an Apple Authorized Specialist (AASP+Retail sales) in Los Angeles. Also, I sadly have had enough experience with these machines to confidently make the claims that I have made and not feel like anywhere near as much of an idiot as you paint me out to be here at the end of the day.