So, this is one is easy. In the future (let's say in 50 years) one would be able to buy brand-new old-model products. For example:
- I would be able to buy a brand-new iPod Classic 1st generation from Apple itself (and it will work just fine if I plug it in my MBP 2070, because software compatibility in the year 2070 is awesome).
- I would be able to buy any Nike sneaker model as brand new! It doesn't matter which model, every model since Nike is Nike is available and they are being sold as brand new! No software compatibility is needed in this case, though :)
- Buy any edition of any magazine. Brand new!
If you want a first-gen iPod buy one now (and some extras for spare parts).