I'm personally in favor of the concept.
I don't care about the endings; they can leave all that out. What I care about are certain decisions leading up to the endings. Was the genophage cured? Were the rachni wiped out? Did the geth, quarians or both survive?
That's it. That's all I care about. Make a Keep-themed website, answer those questions, let them have an impact on the game, and I'm happy.
I don't care what color light Shepard chose. I don't care who Shepard f*cked. Just let us answer what species are alive and which ones aren't to make it onto the Ark.
I would rather they include this option and include these species for those who spared them than not include the option and not include the species at all because they're worried about pissing off the people who could have killed them.