Fair enough but the Beatles point still stands, then there's Madonna, Elton John, Kylie etc.
To claim pop artists don't have longevity and only rock bands do is demonstrably false.
I don't think Kylie will be remembered in time,
Madonna & Elvis (the best examples of "pop singers") are only remembered because of the drama/controversy/being a fashion icon, not really for musical talent.
Elton John is an actual song-writer/pianist - so not really comparable, he's a solo artist not a "pop musician".
The Beatles while poppy in style, could write songs & play instruments - something which modern pop artists can't do.
Rock music which becomes popular, isn't the same as pop music - which is made popular (in a commercial manufactured sense through exposure).
To nit pick further.
"Pop music (a term that originally derives from an abbreviation of "popular") is a genre of popular music which originated in its modern form in the 1950s, deriving from rock and roll. The terms popular music and pop music are often used interchangeably, even though the former is a description of music which is popular (and can include any style), whilst the latter is a specific genre containing qualities of mass appeal."
I (clearly) meant the latter.
This quote puts it best,
According to Simon Frith pop music is produced "as a matter of enterprise not art", is "designed to appeal to everyone" and "doesn't come from any particular place or mark off any particular taste". It is "not driven by any significant ambition except profit and commercial reward ... and, in musical terms, it is essentially conservative". It is, "provided from on high (by record companies, radio programmers and concert promoters) rather than being made from below ... Pop is not a do-it-yourself music but is professionally produced and packaged"