It seems to me that you're too caught up in specs. What do you actually need the computer for? I'd focus on that more than the spec sheet.
Care to put your money where your mouth is? I'd gladly bet against you. Those are some bold predictions.
Sure, what do you want to do, through venmo or something. Just set it up, and make sure it's legal in NY, I'd be happy to do that. We won't know the outcome until about 2022 anyways.
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Personally I don’t see foldable displays maturing sufficiently anytime soon. They may appear on shows and perhaps even make it into the odd niche device by some small company trying to gather attention. But I doubt they’ll become mainstream. The whole IT industry has worked towards eliminating moving parts to improve reliability (and to a certain extent cost position), so going for a foldable display would be a step backwards.
I do, however, agree with your POV that tablets will have a harder time in the future, especially in the high end sector. There I expect proper VR/AR displays (as in „normal-sized glasses with integrated display“) to mature and replace tablets, probably with some wearable (such as e.g. an Apple Watch) becoming the logic core driving the displays and coordinating user interfacing (e.g. gestures for interaction).
The low cost sector will probably stick to standard tablets for a couple years longer, until VR/AR glasses will become mainstream and affordable.
Well, multiple companies are already about to release devices over this winter, granted will be low volume boutique parts. If you looked back at the original curved display phones on the mass market (Note 4 edge, Late 2014), it took maybe another 18 months for the market to widely adopt that, and becoming common place by the time Galaxy S7 came out. Granted there is a little more durability concerns with moving parts, it shouldn't really take more than 4 years for that to mature sufficiently for these to become volume products.
That's where the iphone XS Max successor in a couple of years will be. Something like a 6.5" folded out to 9" would really be very suitable to replace both phone and tablet functionality. iPads are just not a long term viable category of product, it's destined to be overtaken by larger iphones.
Just to add, I definitely also agree with you about the projection type of displays with AR. We have already seen a few prototypes of devices that would work that way. That would also eventually be able to challenge for a piece of living room display, if the projection tech's quality gets good enough.