Riven mains, what do you think about these Black Cleaver changes?

The full item is still decent, only 10 less AD than it used to be which isn't terrible as we mostly got it for the armor pen and as the cheapest form of CDR. However, with Caulfields no longer building into it, our early game build path is now atrocious. Phage is not a bad item, but it doesn't give CDR and doesn't give as much damage as a Caulfields.

Kindlegem start is just not good. Especially with mastery damage going down, we're not gonna do any damage with a level six all in... with a Kindlegem.

So what do you think is gonna happen? Are we going to just first back a Phage instead? Will we grab a Caulfields then Black Cleaver (against tanks)? Or is Black Cleaver gonna be put off as a third or fourth item in our build, with Lethality or lifesteal, and CDR as our first item (Youmuus/Death's Dance)? Will we fill out 40% CDR with Lucidity boots and Maw/DD instead of Black Cleaver?

I know with the Lethality build that we've been abusing, this doesn't affect it too much unless against a full tank. But will that build become the optimal one after the nerfs? Youmuu's Lethality is getting dropped down to 15, which is a direct nerf which will probably stack with the possible 50%-50% change to Lethality's scaling.

I'm wondering whether we'll be replacing Black Cleaver with a straight up Last Whisper item for slot efficiency (particularly if we need the Grevious Wounds, we'll need that item slot!) as well as 50 more AD. The burst is also probably stronger, negating almost half of any Guardian Angels or Zhonya's being built, which amounts to more than BC would be shredding, as BC shred would not be applying to our first three instances of damage (actually not sure how this works, as Riven will deal three instances of damage in a single frame if combo'd correctly. Not sure how this interacts with Black Cleaver as of now, would all three be facing no armor reduction? Or all three facing the complete 15% armor shred which they'd shred upon hitting?)

Or do we just suffer through the bad build path and come out with a very similar item to what we had beforehand, except our laning is now both safer but with less kill potential?