It's not strictly THAT or ONE laptop though. It's the concept of old Thinkpad laptops in general: since there is already a big enough refurbishment market active, parts will still be produced or stored and sold, thus permitting that kind of laptop to be repaired and survive. Even if you apply the "ship of Theseus" logic, it won't matter. It won't be the same original Thinkpad, but it will still be a Thinkpad (flies like a Thinkpad, sings like a Thinkpad...)