Barely, still not worth the money, 2-3 absolute max imo.
Yep, all 4 way scaling is poor
I'd stay to 3 max as well. Cheaper overall since you don't need a massive quality PSU, EATX motherboard, EATX chassis, and copious amounts of cooler.
I do hope it's true that DX12 allows for better overall scaling and better communication.