While it's true there's unlikely to be any future RT devices or significant updates to Windows RT, I wouldn't bury it quite yet.
Windows RT is largely stable and still performs. My girlfriend by far prefers her Surface 2 over my Surface Pro 3 running Windows 10.
Of course, it depends on what you want out of the system - if it's just general web browsing, email and the odd app, it works just fine.
WinRT isn't the operating system, guys. It's the development platform. The "modern" platform, and now the Universal platform is an extension of WinRT. The future is, I hope, very bright. It's different technology, but so was Win32 at some point. Once it gets perfected, I think WinRT will be much better than Win32 ever was.
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It's my understanding that there will be no W10 for RT. There is an optional update that gives you the Start screen like W10 but that's it. The cool part about it is you have the choice to use the standard 8.1 "tablet" mode or the W10 start. I'm using the W10 mode on my 2520 and I have the best of both worlds. Some users decried W10 on x86 devices because it removed the charms bar and some other features. Well, RT still has the charms, swipe-down-to-close apps, split screen, etc. As for apps, most of the old ARM apps have been replaced with Universals in the store so I'm confident that apps will not be a problem going forward.From what I understand there is a version of win10 coming for arm products. If that is the case, then RT surface products will be revived. at which point I will buy a couple of surface 2 RTs and have a couple of extra cheap devices....maybe I should buy them now!...ha ha.
There is an optional update that gives you the Start screen like W10 but that's it. The cool part about it is you have the choice to use the standard 8.1 "tablet" mode or the W10 start. I'm using the W10 mode on my 2520 and I have the best of both worlds.