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And if players decide to make a fully pve server, yeah, BH won't be required. But we'll have to see if other players will let them do that.
I'd assume that PvE servers will be the ones who require BHs the most, because those servers will be "pve" only in players' minds, not in its system limitations. And if there's an idyllic place somewhere, sooner or later some dick will come and try to destroy it.
And on any "PvP" server PKers will be present because competitive players will be using corruption system as a tool to get an upper hand, so BHs will probably be quite popular too.
So if anything, I feel like the game will always need BHs. Even if Intrepid overtune corruption values so much that PKing is as rare as you hope it'll be, some dudes will still make throwaway characters just to get on pvers' nerves. And if the BH profession is super rare on some server, PKers will learn about that soon enough and just come there "to have some fun".
Which is why imo being a BH should be quite rewarding and useful. But until we learn about all the balancing details of these systems, we won't know how exactly Intrepid is planning to make that profession either of those things.