That's all true, but the end of life hardware specs still ring true, don't they? If the iPad 2 suddenly becomes obsolete wouldn't the mini follow due to having the same guts? That's what the other poster was getting at, I think?
That's what the "Sure" means. It's clearly old tech...but old tech is useful if that's what it takes to make it hand-holdable device for long periods. That and higher ppi (meaning they don't really have the same guts). So, given that the iPad mini just came out in Nov, I have a hard time seeing it being "no longer in use" any time soon. But if you want a 9.7-inch iPad, the only reason to get an iPad 2 is because of cost, as it offers very little that the iPad 4 doesn't offer. The mini and the iPad 4 are different form factor devices. Handing them in your hands for long periods leads to two very different experiences. Apple will likely drop the iPad 2 before it drops the mini just for that reason.
And end of life hardware specs don't ring true, though. The Mini plays games quite nicely. I've been comparing it to the 3, the Nexus 7 and the Nexus 10 using Beach Buggy Blitz. The Nexus devices will drop frames under certain conditions while the Mini and the 3 don't. It's like the xBox and PS...they have run games over nearly a decade without any hardware changes simply because they run games designed for the hardware and the hardware is static.
The same goes for lots of microprocessors, too. While only PCs use the higher end processors, these are zillions of other devices that use microprocessors that are slower and less capable, but find use in devices that are special purpose. Automobiles have lots of special-use microprocessors inside. They are certainly not obsolete, either.