A Little Brainstorming For The Girls This Time...

[Shepherd]

Jorlem wrote:

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Spoiler [+]
IIRC, Kyubey says or implies something to the effect that humans are the first species they found, when they went searching for an energy source that violated thermodynamics, when he is explaining everything to Madoka.  He also says something along the lines of that when humanity joins the greater community among the stars, there will still be stars for them to do so thanks to the sacrifices of the magical girls.  So it isn't just them, and destroying humanity wasn't the original plan, but the opportunity  to get everything they needed at once was given to them on a silver platter.  Remember, Madoka's super-witch couldn't have existed without Homura distorting karma.  Also, the series finale literally involved the total destruction and rebooting of the universe.  Whatever plan the Incubators had, that wasn't it. 

I was basing my info on the PMMM wiki page for Kyubey, which has a section labeled: Speculation - The theories below have been proven right.
The specific entry indicated:

Spoiler

• He also states that his/their reasons for creating magic girls is so that new cultures can arise without the heat death of the universe preventing that. He seems rather nonchalant about leaving Earth to be destroyed at the hands of Kriemhild Gretchen in timeline 4. Given that nearly all of the population dynamics models made for the Puella Magica world will inevitably result in the destruction of life on that planet and that Earth is clearly not the only world harvested by Kyubey's race, their reasoning seems rather suspect. Assuming they really are collecting the energy to stave off the heat death of the universe, for other cultures doesn't appear to be their reason for doing it. If he is consciously lying about the reason, then this would make his story to Madoka another attempt to manipulate her by claiming it's 'for the greater good.' Additionally, if this was the reason and if magic/wishes can really do anything, then why not simply explain it to someone and ask them to make a wish to prevent the universe from suffering heat death? Surely someone somewhere in the universe would be willing to make such a wish.
  

Confirmation: This is actually said. in the anime.

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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV