Honestly, I think it's a little of both. A few of the newer FF releases haven't been up to par with the ones that preceded it - *glares at X and X-2* - but I think a lot of it also has to do with the market values and people throwing fits over everything.
Take the FFXIII arc, for instance. I've heard quite a lot of negativity about the first two games in the so-far trilogy (it DOES still count even if the third one's not released yet, right?), when I personally have had my faith in the series boosted by them. And this is Mr. Conductor talking - with the exception of XI, XII, and XIX (though I still know their synopses), I've played them all heavily - and I know what I'm talking about.
But, I'm going to just point at the massive amount of hate FFXIII-2 is getting over the time-travel plot. Most of the people bitching about it are the same people who won't hesitate to jump the gun and say Chrono Trigger is one of the best games ever. The monster-capturing? FFV did that with the Beast Master, as did VI with Relm's Sketch ability (a little different, but the basic premise is the same). Chrono Trigger had the time-travel generality (hell, even the loading screen/vortex for going between times in XIII-2 is strongly reminiscent of Trigger's inside-the-Gate vortex), though XIII-2 touches on the three main theories of time travel (fixed timeline, dynamic timeline, and multiverse timeline, respectively) a little more in-depth than CT did (though, to be fair, CT did have its fair share of back-and-forthing due to dynamic timeline changes). One would imagine elaborating more on one of the main things that made Chrono Trigger so beloved and timeless (pun intended?) would only improve its quality, but the market and fandoms have never been known to be entirely logical.
But yeah, I'd say it's a little bit of Square-Enix either starting to plateau for the fall or going through the inevitable rough patch, and a little bit of the fandom/market being unreasonable and silly.