cyr :
When they kill xp lets say after a few years from now when they kill xp will windows xp become like a collectors item in a way in terms of rarity and price or will xp become dust
Almost no modern technology ends up as a collectible. Unless it had/has a huge following and is rare.
Original working Atari (especially with a bunch of games included) is nostalgic, collectible. Original Play Station or XBOX? Old junk now.
Your old Pentium 4 PC, junk. A working Commodore 64 with a bunch of add-ons, collectible.
They may not be valuable (unless you get a very early model and maybe one that was signed by the creators), but at least there is some demand for them.
Original DOS disks (especially the very early ones), collectible. Windows disks, nope. Especially after the writable CD and electronic download era where you can create a thousand copies in one click.