how so? I wanted FMP this year
Xebec has been way behind on their shows. For some reason, the scheduling started to fall apart late into Keijo resulting in them barely finishing in time. Right after they had Bang Dream in Winter that they punted off to Xebec Zwei but that wasn't enough and Bang Dream's production has been a shitshow for its entire broadcasting run. Then Xebec has Clockwork Planet airing this season that looks as if it also is suffering as there has been a dearth of animation shown. Not to mention Yamato 2202 in the background which supposedly had a noticeable quality drop compared to 2199 but that could also be due to the staff involved. The point is that Xebec bit off way more than they can chew and are playing catchup.
Now normally Xebec could try and outsource episodes of FMP however the problem is that they have to largely do the entire show in-house barring things like the backgrounds due to Nishii's CG/2D style. It's also a more intensive production than pretty much anything else Xebec is doing besides Yamato due to both mechs and the general higher quality. Well there is Fafner but that shit ain't coming out till 2019 at the earliest anyway.
I imagine it's less that the show itself is falling behind but rather everything else Xebec is working on. It's a great thing though that they're willing to push back the broadcasting date to maintain the quality they're aiming for rather than just shove it out the door. There isn't a reason it has to air this year to begin with as the release isn't tied to a novel publishing date or anything of that nature. Besides next year is better for marketing reasons anyway as it would be FMP's 20th initial publishing anniversary.