I read your post twice thinking you said "paper" as a farewell to books and printed materials. :-) Thinking on that topic, I can think of a large number of items which may be "obsolete" for some people but not all, or that are definitely obsolete but also definitely existed prior to current lifetimes, or that clearly will become obsolete but have not yet...

Devices or products:

- comprehensive printed user manuals with most tech products

- newspapers

- paper road maps

- compact/pocket cameras

- digital SLR cameras

- home slide projectors

- home film/negative scanners

- many hand-held paper scanners, light pens, etc.

- consumer video cameras (displaced by smartphones)

- digital video capture peripherals

- portable, single function "transistor" radios

- walkman-style portable tape, CD, minidisc players (approx 1 album at a time)

- MP3 and iPod style portable players (large music collection)

- pagers

- personal digital assistant (PDA)

- wired headphones, for music or phone

- dedicated, single function wrist watches

- dedicated, single function GPS navigators

- CB radios, as a popular fad

- 2-way amateur radios, aka walkie-talkies

- land-line telephones

- cordless handsets for land-line telephones

- actual answering machines

- analog, 1G, and 2G cell phones

- pagers

- dial-up modems

- fax machines

- wired office or home LAN

- typewriters

- dot-matrix and other impact printers

- CRT displays

- LCD displays with fluorescent backlights

- incandescent home lighting

- incandescent portable lighting (flashlights, headlamps,
bicycle lamps etc.)

- incandescent automotive lighting

- high-intensity discharge (HID) automotive headlamps

- compact-fluorescent home lighting

- sodium vapor street/industrial lighting

- dry-cell "lantern" batteries

- gasoline automobiles (in our lifetimes?)

- natural gas appliances in homes (in our lifetimes?)

- wood shake roofing (banned in areas with fire safety concerns)

- mechanical, analog thermostats for home heating

- 26" wheeled mountain bikes (displaced by 27.5" and 29")

- round metal garbage cans

Media and form-factors:

- photography film

- polaroid instant film

- vinyl records

- reel-to-reel, 8-track and cassette audio tapes

- analog video tape (VHS, BETAMAX)

- laserdisc

- digital audio tape (DAT)

- floppy disk

- CD-ROM

- 5.25" HDD from early PCs

- 1.8" HDD from early iPod etc.

- any HDD in laptops

- bus standards: ISA, MCA, VLB, PCI

- disk controllers: MFM, RLL, IDE, SCSI

- laptop bus standards: PCMCIA, PC-Card

- peripheral standards: serial, parallel, AT keyboard,
firewire, eSATA, VGA

Services or infrastructure:

- film development/photo printing booths and labs

- milkman home delivery

- "garbage man" who picks up cans to dump into collection
trucks

- neighborhood newspaper delivery boy

- mail order catalogs other than those targeting the elderly

- staffed toll booths to pay with cash or get change

- cost effective shoe repair

- diaper service

- retail small appliance, TV, electronics repair

- vacuum tube testers in retail stores

- dial-up BBS or other non-internet services

- internet service from schools and employers (rather than
relying on commercial ISPs)

- pager networks

- analog, 1G, and 2G cell networks

- analog television broadcasts

- cable television

(edited to attempt to rescue my obsolete text formatting skills)