How did 70s rock music transition into 80s music?

80s music appeared to be a re-visitation of the beginning of Rock — when "singles" ruled the AM radio. In those early days, in the event that a craftsman had a hit, he/she could get to record an "collection" (when those modern LP records appeared). A LP could have two hits and 10 tunes of forgettable filler melodies. Most craftsmen were characterized by their hit singles.

The 60s and 70s saw an ascent in FM radio and AOR (Album Oriented Rock) which gave numerous specialists the opportunity to make bigger works, or gatherings of melodies which frequently remained all in all work, and empowered a more extended tuning in/focus time. Beside funk and disco dance hits, the 70s inclined towards Album Oriented Rock.

The 80s saw a swing away from longer works and AOR, and back towards snappy singles. I'd say MTV had a great deal to do with the progress to 80s music. ("Video killed the radio star"):

MTV presented many gatherings who had fantastic singles, yet probably won't have accomplished acknowledgment without MTV video openness: Squeeze, The Vapors, Duran, Adam and the Ants, the B-52s, The Cars — to give some examples. (Note, I said "may" — yet that is my hypothesis.)
MTV constrained many long settled stars — David Bowie, Rod Stewart, even The Rolling Stones — to make video-commendable tunes. (That is — SINGLES.)
Peter Gabriel is a story regardless of anyone else's opinion. He was genuinely known from his Genesis Days — yet those astonishing recordings of "For sure" and "Demolition hammer" certainly kicked him into the super frightening.
MTV — after a ton of asking, cajoling, and dangers — at last changed their bigoted whites-just strategy, and began broadcasting recordings by people like Michael Jackson and Prince — presenting various dark craftsman to a lot bigger crowd.
In outline, I think MTV during the 80s — and later the Internet and YouTube — abbreviated individuals' capacity to focus, made a market weighty on short snappy singles, and made it progressively hard for craftsman to make "collections" which would allow them an opportunity to introduce their bigger vision.