I've already had to rewrite "Pay phones" out of one story (except in an office building or hospital, where you could still find an antique model), and "CD-Rom games" out of another...
We've had so many of the classics named, how about:
- Travel agents
- Those hard square 1MB computer disks (anyone even remember why they were called "floppy"?)
- "Regular" light bulbs

:
those weird, smelly roller machines that copied paper before photocopiers (I forget what they were called)
- Ditto machines, a relative of
- Carbon paper
And "Don't touch that dial!" brings up all the other things we've lost from TV:
- "Scheduled" TV shows (every Tuesday night for Happy Days!)
- TV theme songs (I had to reference the Gilligan theme in one book, and wasn't sure whether kids would remember it)
- Classic reruns (ditto)
- Looking up episode descriptions in TV Guide
- Locally-produced shows (our local PBS has got probably one of the last local high-school academic-bowls in the country)
And the one thing I could write an entire essay about:

:
- the Late-Night Movie (When you start examining the cultural ramifications of a generation not getting to see random old movies for free anymore, if you don't own TCM, the longterm effects on the culture start becoming scary...I can watch Gone With the Wind on Blu-ray, but 80% of college students literally have no idea who the Marx Brothers are.)