Her focus is more on "where did the passion go" than "why the prevalance of divorce", but basically she agrees with Coontz, and I tend to think they both have something.
Interestingly, Perel also warns about the dangers of immoderate child-centrism to the romantic and sexual facets of the marriage.
"Show me a completely smooth operation and I'll show you someone who's covering mistakes. Real boats rock." -- Frank Herbert