I think you should be asking two questions:
Will diveops require cavern/cave certs? (The answer is no)
Should I have cavern/cave training before entering those enviroments? (My answer would be yes)
I am cave certified but still did some cavern tours in Riviera Maya last year. The other divers on the tour were ok, for OW-divers, they still silted quite a bit. The guide was in doubles but didn´t have cave training beyond cavern. IMO none of the others would have gotten out had something happened to the guide. They were doing a "trust me dive" and it wasn´t safe...1/3s won´t help you if you don´t know the way out...
Will diveops require cavern/cave certs? (The answer is no)
Should I have cavern/cave training before entering those enviroments? (My answer would be yes)
I am cave certified but still did some cavern tours in Riviera Maya last year. The other divers on the tour were ok, for OW-divers, they still silted quite a bit. The guide was in doubles but didn´t have cave training beyond cavern. IMO none of the others would have gotten out had something happened to the guide. They were doing a "trust me dive" and it wasn´t safe...1/3s won´t help you if you don´t know the way out...