A lot of people expected FMAB to do badly. Honestly, a lot of the people who would watch this, have already seen the first show, and the first several episodes are basically a retelling of the first season. It was going to be an uphill battle regardless. Plus, the show just isn't as good as the first, and the dub is even considerably worse than the first. But on the bright side, it is still in the top 5, but if ratings keep falling, it won't remain there for long.
I think the streaming of this online may have actually hurt the eventual TV airing. I know a lot of people that streamed the show, but have no interest in the TV airing, despite the dub.
Anyway, I'm not surprised to see NickToons pick up DBK. They've been looking into anime for a while, and even commissioned a few original projects, though I don't think any of those ever premiered. Also, they've been heavily aiming for the young male audience, and Dragon Ball is a perfect fit.