Okay, so the next 10 weeks will be very slow, I predict there will be a lot of filler fighter by the side characters.
It's still 3 months until Ussop vs Sugar round 2, until then, I predict there will be good animation for Sabo's and Diamante's scenes, hopefully.
Predicting that we will see a new opening early April when the new anime season begins. Toei has enough material by now, they'll probably showcase Law's backstory and the final battles in Dressrosa.
The next 4 months will be the most unbearable for this arc, it may be the worst time for them to drop below a 1 chapter ratio.
So basically, "bite the pillow".
I too agree that the "slow" parts of this arc will be poorly reflected in the anime, with some spots of hope there and again, eventually coming back up once the fights/flashbacks begin. Do I think it'll be as bad as Fishman Island got? No. I just hope Toei has enough common sense to at least pad out with some of the [b[massive[/b] cast that Dressrosa has given us.