IMO one of the cool things about the Bone Dragon adjustment is that it's not really a nerf.
Yes, it creates fewer giant skull spams, BUT, it also strips less per turn meaning you can now cast BD multiple times on the same foe. In terms of strategy it leaves a lot of Skulls around, but I think there are new opportunities to explore different ideas like pairing Entangle troops with BD and other Skull creators like Skeleton and Skeleros and The Devoted and Guardians. I think there are expanded opportunities now to pair BD with other Skull spammers like Sheggra, Keeper of Souls, etc.
Bone Dragon can now be better-paired with troops that do AoE damage because they don't step on each others' toes as much. Hello to the new bro-mance of Terraxis and BD. I call them "Stones n' Bones" and you heard it here first ;)
There seem to be better strategy opportunities with troops that explode or remove skulls too (note the Carnex re-work). It should also decrease the "now what?" factor when playing with BD which is when you hit that "sweet spot" where your BD just NUKES the top troop but leaves really nothing left on the board, resulting in play severely stalling while Mana is gathered again for the next cast.
It's just my opinion but I view it as less of a nerf, and more of an expansion of the utility of BD into more areas of the game while simultaneously reducing the annoying cheese factor. Time will tell of course.
reason for edits: I hate it when I spell poorly. This and hashtag #stonesnbones