I mean it doesn't matter either way, if you have enough rage for a rampage, whirlwind beforehand and end up just short of enough rage for rampage, worst case scenario you spend a global on FS and then Rampage. The buff from Meat Cleaver lasts long enough that it isn't that big of a deal if you don't rampage directly after. Even if BT comes off CD you can Meat Cleaver that, WW, then Rampage after.
I'd argue that WW isn't even conflicting rage management. Something like early Heroic Strike was, since it was a straight damage ability just like Rampage, but gained none of the bonuses that Rampage gave. But since WW is not only a damage ability, but also enables Meat Cleaving making it "worthy" of spending rage on. It's not really a big deal either way to me, sure free WW is nice, just not something that was particularly necessary, not gonna complain, it's basically a direct buff to Rampage-Enrage uptime.
On another note, is the GCD of Rampage fixed yet?