That will be the end of whatsapp then and any other mainstream secure messaging platforms. Probably will do eff all for the real bad actors, paedos and deviants.
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But you're right about the real bad actors, they already don't trust these platforms anyway.
That said, "grooming" in the broadest sense of the word happens on channels like Whatsapp, Instagram, even Pinterest for some reason because it's not blocked as social media by popular wifi filters.
Ex: girl (14) our son was friends with "had sex" with someone who claimed to be 18, but he recorded the interaction and used it to blackmail her to do more / other stuff. I don't know the details but that kinda thing happened via Whatsapp.