In one case it worked out great (BW), but BM's problems had nothing to do with having no humans and much more to do with rampant OOC-ness.
Originally Posted by Undrave
As for Plot, Lauren Faust wanted to extend the Nightmare moon storyline to 7-8 episodes(presumably one for each pony), but hasbro made her cut it down to two.
Given the show's success, some of the few hints she's given for season two is that there will be more "bosses" on or near Nightmare Moon's caliber, as well as Luna returning and Nightmare Moon being the result of someone else imbuing her with "Dark Energy". So it looks like she's been given more freedom for S2.
Meanwhile, what we've had are some great charachter development episodes for all the charachters (as well as a few mediocre episodes), and since there isn`t a goal in sight (such as in Transformers Prime) it dosen`t feel nearly as tiring as TP does for not really "going anywhere".
Not to mention that the mechanics of the world itself are interesting on their own to learn about. Every aspect of nature dosen`t happen on its own, and even the rise of the sun and moon need to be controlled. Such a thing could be the result of a formerly tidally locked world that has been brought to natural rotation by the power of its inhabitants, or even an artificial(magically created) environment floating in the stars.
I am the squid of the vapor surrounding your dreams, sorrow, nightmares, and bootie pants. So watch out about that.