That's right tablets are the fastest growing tech out in the PC word.
This is a common mistake. Tablets (and smartphones) are a NEW device, a device that most people don't have already.
So the sales figures are huge, but will eventually level and drop to a far lower number once the market is saturated. Everyone is scrambling to develop ARM stuff now because now it's still possible to get in the market with a realistic investment, when it stabilizes there will be already major players and the technology/manufacturing base required will be so huge that will be harder or impossible to do so.
The same happened with computers some decades ago. It's practically impossible to compete
now with Intel, AMD or even VIA with x86 processors/chipsets.
More and more people are buying them as opposed to desktops.
This is true, tablets can do what the average household PC can do, so the cheap prebuilt PC sales are plummeting (also because of the so-called "white box" tablets at under 100$, another way of saying "cheap crap from China").
But desktops still have a place and will keep selling strong in Businness/corporate and PC gaming/Home working segments. These two aren't significantly impacted by tablets simply because:
A) in most cases portability is irrelevant as the worker has his own station/office/cubicle.
B) tablets and touchscreens in general
spectacularly fail all applicable laws about work safety in an office (screen-eye distance, correct posture, correct support for arms). They are cool for cash registers and other simple stuff, but that's it.
C) they lack the power to run any decent PC/Console game nor can run seriously demanding software and will remain this way for at least 4-5 years (assuming that the fact both new consoles with a brawny 8-core x86 CPU does not impact the resources required to play games, I think it will and tablets will remain too weak indefinitely).
The stupid things Microsoft is doing with windows 8 on desktop computer isn't going to bolster PC sales on such desktop environments (especially business), so they are partly responsible for decrease of PC sales.
Also because of retraining costs. Any guy working in an IT department still has
nightmares about other employees constantly calling for assistance and asking him how to do something when the enterprise transitioned to using a version of Office that dropped the standard interface and went with the new, modern and "cooler" one with the stripes and moved the buttons all over the place.
If anything I would argue Microsoft is actually trying to save the desktop by proving an OS that's actually trying to converge all the available tech out there to work on both desktop and mobile devices. Suddenly I can use my desktop in ways mobile devices work, and be able to have that tech with me when I go mobile using my tablet or smartphone.
Except it's just the same UI and the programs you use on computers won't work on ARM devices. I frankly don't see the point of having a clearly touch-based interface when the screen is clearly NOT touchscreen.
It's just that everyone is now looking to Microsoft to stop the slide; and not even they can do so. And so the next logical step is to create an OS that integrates with the mobile technology and desktop OS.
I agree. The point is that MS is doing it wrong.
Ubuntu's Unity interface for example is good for both tablets and non-touch-screen desktops (for phones it's a bit sucky and it's why they have developed a phone UI). It got its own hails of flak for various reasons and prompted the most hardcore desktop fans to fork and create Mint, but it works and allows easy multitasking/multiwindow use.
Metro or The Modern UI is awesome on a phone or a tablet (they ripped off Windows phone UI, so yeah, it was designed for such devices), but fails on a desktop.
All the tiles are pointless without a toucscreen and to do work you need to go into Desktop mode, create your own start menu (because the program-opening menus are again optimized for touchscreens and are a pain to use with a mouse) and then do stuff like the old way. WTF?? Is this supposed to be "integrating"?