While you lecture me about logic and accuse me of things I don't claim, you might try asking yourself the proper question, which is not "Can we imagine the survival of capitalism without imperialism?," but "Can we imagine the actually-existing overclass dropping imperialism and foregoing the many benefits it receives from having its boot on the neck of the Third World?"
You and Wojtek subscribe to the idea that it's all a big mistake, and that the world's business elites would not mind losing their ability to move factories to ever-lower-wage areas, buy extra-cheap Third World commodities, and not having to deal with the massively increased political pressure from below that non-imperialism would unleash. None of this really matters much to them, you claim.
Conclusion: We disagree, in spades.