Okay, hm. Good. Let me just explain my idea a little more, and then use that to gague interest.
1) The reason I chosen Tenth Reich is because the idea of there being a 4th, 5th, 6th, 7th, 8th, and 9th Reich that all gained power and all collasped seems rather interesting to me. It seems rather surreal to me, that an idea could somehow still survive. I don't think the Tenth Reich are going to be protrayed as a positive light though, they really are just Space Nazis, and I doubt most people would play for them. But they could. I guess. As part of a scheme to fill the Space Nazis with Sleepers and turn them into Space Liberal Democrats, or something.
2) In order to contact to the past and future, you need to have some sort of special Time Communication occultical ritutals. That need to be set up by special people, and it has been set up by certain Reiches. Some Reiches do have them, other Reiches do not.
I guess the best way of handwaving this away is to claim that the Tenth Reich has not been able to find anybody to talk to into the future, Reich or non-Reich. This just boosts the paranoia of the Tenth Reich leaders further.
3) Vicki, the creator of The Lance, said this quote, to the effect, basically of "The Tenth Reich would last for 100,000 years." Many Tenth Reich leaders saw this as just a happy quote, as a way to bring hope to the Space Nazis (Vicki didn't really mean that the Reich will suddenly implode in 100,000 years). At the begining of the Riech, this quote was promoted by the founders of the Reich, as a way to boost up morale. Now that 99,995 years has past, the Tenth Reich is being wracked by rebellions as this quote has basically being used to say, "In 5 years, the Reich will fall. We now have a chance to win!" Many Tenth Reich leaders just see this as a self-fufiling properchy, but some Tenth Reich leaders believe that prehaps The Lance might fall apart in 5 years, and is busy making precautions to ease the transition to an 11th Reich, if it is possible.
* Servant Corps shrugs.
EDIT:
As for a history of the 4th-9th Reiches, well...I haven't really came up with that. I was thinking of providing hints and histories. I did have a semi-detailed backstory for the 4th Reich though. A couple of Nazi Occult researchers was able to contact the 10th Reich, who, inspired by the belief that the 10th Reich could actually exist, was able to begin a secret program to basically colonize the far reaches of space, with one of their recruits, Sarah Synder, being the first Furher of this Fourth Reich.
I also found
the 10th Reich's blog that I used when I used this concept previously in another game in the past, dealing with the Thule Society.