I guess we're pretty gullible
Or it might be that we are locked in to an extent, we bought when Apple came up with a tablet people could actually use rather than waiting for everyone else to scramble to make me too products. I probably have over $300 worth of software (at original purchase price, I'm sure a lot has been discounted now) on my device, plus maybe another $200 of TV shows, music etc. I could probably fight to transfer the media to another tablet but seriously, why would I bother? Right now this shares between my iPad and my wife's iPhone seamlessly, after I buy a new device it'll continue to share between those 2 as long as the new device plays nicely. Yes I know that means I'm caught in Apples net but it's not so bad as it all works. Anyway, let's look at your points as they are.
The cost difference of the device depreciated over the amount of time I've had the 1st generation one it is negligible, I mean what are we talking here, less than $10 a month, less than $5 (I don't know what an equivalent transformer costs)? If that's an issue for you then you probably should save money for food not tablets. What about resale value, are people lining up for second hand transformers (again I don't know the answer, just asking)?
Performance? Really? You've done a side by side comparison of real world application performance, with the new iPad? That's awesome. Or is this about on paper specifications that no one in the general population (you know the big group where products make most money) cares about. I very much doubt there is a significant performance difference in actual use cases that I'm likely to come across. If I'm wrong then I'm sure that will come out in the next month which will be before I 'upgrade'.
Weight and thickness, again I'm in awe that you think you'll detect this in use, but then I'm still using an iPad 1 so I suspect this isn't going to be an issue for me. I'll give you that the noise Apple made about thin and light last time sets them up for this but that's something for you to direct to Apple (I'm sure they'll take your feedback into account) not the owners of the devices. Honestly, we don't care, that's not why we buy them.
Capacity... erm? I've not filled the 64Gb I've got but then I tend not to keep every bit of media I've ever owned on my tablet. How much extra do you have or is this a usual complaint about not being able to plug in extra storage? Do you not have access to the could where you are? What part of history are you living in? I can already plug in the SD card from my camera or the camera directly by USB (yes I had to buy a cable but I already own it so money already sunk again) which is about the only use case I can think of where I'd need external storage that doesn't come via the network.
OS... Well that's a bit subjective. I'll give you that recent iOS releases seem to have been buggy and rushed out the door but the interface is what I'm used to using. I've used Android, it's fine but I find it harder to use due to lack of familiarity. Applications seem to run slower on it as well but that might be confirmation bias on my part, bad application coding or just the device I was using (no standardization y'see). Again I'm not going to swap to something that is as good or just a little bit better, it would need to do something really interesting to make the leap worthwhile.
I'm afraid you're going to have to significantly expand your etc, etc to show me the use case that would make me think that I should move away from Apple. I would move with a compelling reason that was enough to overcome the inertia of existing software and familiarity but nothing you've presented here gives me that. I suspect that you're not in Apples target market (normal non techie consumers with money to spend regularly driving their 30% store cut) hence this won't appeal to you. If I'm wrong appologies for the mischaracterization.
Oh and tethering, so I'd need to get another device to carry around with me? Right now I only need my employer supplied blackberry and my personal iPad. Why on earth would I want to unintegrate something as seamless as a tablet or start paying monthly phone charges to carry another phone?
I'd love to see Android manufactures step up their game, competition drives innovation. I'd be very excited about the device that overcame the ownership inertia as that would be the kind of step change that made me not upgrade my existing laptop and get a tablet 2 years ago, but honestly right now the only differentiating factors I see are a mines bigger than yours in areas where I don't need more :-(
Anyway, let me know if I've missed something important it's not too late to stop me making what you clearly consider to be a serious purchasing mistake, it's advice I'd actualy greatfuly take