I´ve had the same feeling just by doing some preliminary analysis of trends in scientific databases (Scopus, WoK), were one is going down, the other is coming up both in publication rate and in citations. However, I am not so sure about industry yet.
Why would one approach has to go down in order for the other to rise? I believe both approaches have their distinct application areas - and therefore both will survive.
To me agents are just "objects with attitude" (I think I also read this somewhere but don't remember the reference - sorry), but such kind of behaviour is not required for all types of application. Some only require passive objects that do what they are asked to do.