I haven't chimed in on this yet, so I'll speak my peace since I seem to have the time.
I've been lurking around unnoticed once in a while, and I was watching when wind of this first broke. To be honest, I wasn't surprised by this at all. When a year passed after LBT 13 with no word on anything else, I kind of figured this would happen. I didn't expect for them to have the willpower or talent to connect Chomper's return and Ruby's presence in the series with the movies. It was no surprise when I learned that Universal pulled the plug. The series plodded on with numerous sequels with no real forward direction. Some of them might be enjoyable to some of us fans who remember this series from our childhoods and like to hold on to that part of our pasts, but that doesn't generate enough money for Universial to justify continuing to spend money on this series. We might find enjoyment in these sequels, but being as how they're made mainly for the little ones, they're just not very palitable for the average movie conneseur. They figured it was time for them to move on to new and better things.... I also find it rather crass that they decided to stop on LBT 13.
Unless someone magically decides to reboot the series or pick up the pieces, this is the commercial end of The Land Before Time. No more movies or television episodes, and no novels, either. You'd be super lucky to find any new children's books. Is this the end of LBT as a whole? Absolutely not. While this is the end of commercial LBT for the time being, this is also a new begging, and this end by Universal isn't necessarily a bad thing, either. What am I referring to? Fanfiction, fanart, fanon--the imagination of the fans who fondly remember LBT. With no more constraints of sequel upon sequel, we're free to examine the finer details of the series with no worry of conflicting with official canon. We're free to explore what happened between LBT 13 and the series. How did Chomper get back to The Great Valley? We can now let our imaginations run amok and make speculation with what information the movies and series (official canon) do provide, and bridge our own gaps. It's not like we couldn't do this before, but now, there's nothing else in the way to hold us back or say, "No, there's no way Universal would write that in." No sequels or official canon. We can now also make our own LBT 14, LBT 15, etc. Get into the nitty-gritty between the lines. LBT now belongs to the fans. Not commercially speaking (we can't just up and use their characters and things to sell our own merchandise), but we will, for the most part, decide what direction the LBT fandom goes in.
It's time for the fans to pick up where Universal left off (if they haven't already done so). And yes, I know I'm terribly late on the bandwagon, but I've been wanting to say this for a long time, and now, I have the chance to do so.