To be more ah, detched, the reunification war is a lesson to both sides. 1. Anyone thinking of trying to invade the periphery in a big way knows that it won't be fun. Remember that the Reunification war, like the Clan war was mainly an ideological conflict-- the Star League gained nothing materially that they couldn't have gotten through traditional trade and lost a great deal-- I'd bet that when you deducted all the cost of garrisons, both revolts, the need to put togetehr secret bases, even ignoring the devestation the occupation economic dependency policies eventually created, that they likely barely broke even.
2. The Periphery understands that an all out war is going to be terrible for them-- they'd be fighting against enemies that had the high ground, and could launch attacks without endangering their own dependents.
Combine 1, and 2, and anyone with a brain is likely not interested in "Reunification War II Electric Bugaloo".
And to be honest, you don't need it-- right now the periphery needs (especially the OA) the kind of force that can give them a breather from pirate raids. The Ravens need a home-- and even better, the Ravens have a small enough population, and the OA is spread out enough that a common problem, friction between populations, realy isn't a big deal.