So I only read through the first few pages since someone revived this thread from the dead. Interesting timing...
All of the ideas mentioned here are not FFG property and would have to be licensed.
Yeah, that's why I suggested Twilight Imperium on p.7. Also, since FFG already has licencing agreements with other companies like GW, it may be easier to extend and/or broaden existing agreements, which is why I also mentioned 40k.
Though I really dislike the Terrinoth IP, I do agree with you that an in-house IP would be more flexible and might prove better for the long-term health of whatever FFG settles on for the next LCG.