Posted January 13, 2013
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I know several people who have kept their old PCs around though, and they are not even gamers. They give e.g. the older laptop/desktop to their kid when you get a new one, and so on. Some replace obsolete Windows versions with some Linux distro etc. PC hardware doesn't suddenly become useless just because you buy a new PC. And unlike you suggested earlier, most people do not update PCs by replacing components inside; they buy a whole new PC complete, save for maybe peripherals like monitors, keyboards and printers.
And then you also have to take into account that hardware ultimately fails too. My big brother's (who is one of those with two old desktops and a couple of old laptops running in his basement) family has now a bunch of Wii games they can't play because their Wii got broken, and now he is contemplating whether to buy another Wii, or Wii-U, or just forget about their Wii game library. To me it would seem the CD and DVD based consoles break more easily than the old cartridge-based systems.
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The main reason I am not so excited trying to set up emulation on these smartphones/tablets/consoles is that these devices come and go. Got your old Amiga games running on PS2? Great, except that the same emulators will most probably not work on your next console, especially if it is not from Sony. Same with these tablets and smartphones, e.g. I now have an Android phone and tablet, but I feel it is quite probable my next smartphone/tablet will not be Android-based. Could be e.g. WinRT. At which point I'd have to try to figure out the whole emulation thing all over again for the new device.
PCs are more uniform, the very same emulator I used in my earlier PC most probaly works on my next PC too. DOSBox, WinUAE, MAME32, you name it. And unlike most of the Android offerings, these emulators are free too. And unlike with e.g. consoles, they don't require me to mod my PC.
Also the controls may not be that suitable for emulating many old gaming devices, especially with touchscreen devices.