Who needs to upgrade to the next device? More likely, you'll upgrade every N devices, where N depends on your personal needs.

This, incidentally, is almost certainly the purchasing behavior of the vast majority of computer owners. RAM and disk upgrades (particularly on laptops) are performed by a fairly tiny minority of consumers. Yet it seems disproportionately cited when shopping, likely due to an illusion of control or the laughable (in computing terms) myth of "future-proofing".