I'll jump in. I agree with everything you said. Horford is a starting power forward 20 years ago, but an Allstar center today. That shows the shift.
I think we could zig while everyone is zagging. Cousins and Horford could still open the court by shooting threes, but they could also punish around the rim. The problem is who guards who when teams go small? I think you could put Cousins on the big and Horford on the 3 and D wing while having Crowder guard scoring 4s (Durant, James).
The Spurs were already trying to do this last year because their players fit it. CBS had to take notice.
I've always been intrigued on how this would work...
Best case scenario, this would be the 2012-13 Memphis Grizzlies on steroids.
Worst case scenario, this would be the 2015-16 Memphis Grizzlies
Either way, it's in the East so it'll still result in an conference finals
As for the part i highlighted, I would still stay big and impose the slow halfcourt pace on any team that goes small. The reason that Warriors kill in that small lineup is because they rarely ever need to defend Bigs that can go 1on1 in the post, as well as pass off of each other.