It always seemed to me that these events were the beginning of the end of the wide ranging Top 40 radio format in North America. 1982 was a watershed year. Tons of New Wave and its adaptation by many tried and true acts, some of which went downright lame in the process (Styx, Stevie Wonder, Queen, Lionel Ritchie et al...their output from say 1983 to 1987 was bizarre.) Then the rise of rap from 1987 onward...Top 40 was splintered forever.
Contrast that to 1975, when in a major market like Boston, you could listen ONE station and in a single hour hear ZZ Top, The Carpenters, Chicago, The Rolling Stones, The Bellamy Brothers, Led Zep, Glen Campbell, The Beatles, Diana Ross, the Isely Brothers and The Starland Vocal Band.