No, I don't think he seriously contemplated it. Not least because there was a war going on, and he had the concept of duty far too deeply drilled into him. (Even if your insufferable boss isn't your brother, one general murdering the supreme commander is really really bad for morale. And risks civil war. (While already engaged in a three front war.) Unless, of course, you do it secretly, and he just wasn't the type.
Otoh, what certainly crossed his mind in more realistic term was to either do what Ferdinand ended up doing - pretend to be really really sick and bank on the fact that post AW, Fritz wouldn't dare to call it a pretense, then sit out the remaining war and let Fritz see how he manages on his lonesome with his attack-only battle strategies. (Remember, as von Krockow put it re: their share of work: the King won the war, but only because the Prince saved the King.) As to whether he'd lost it (verbally or via at least a Punch) if Fritz had done something like the AW condolence letter not in writing, but in person, the first they met - we'll never know.
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Otoh, what certainly crossed his mind in more realistic term was to either do what Ferdinand ended up doing - pretend to be really really sick and bank on the fact that post AW, Fritz wouldn't dare to call it a pretense, then sit out the remaining war and let Fritz see how he manages on his lonesome with his attack-only battle strategies. (Remember, as von Krockow put it re: their share of work: the King won the war, but only because the Prince saved the King.) As to whether he'd lost it (verbally or via at least a Punch) if Fritz had done something like the AW condolence letter not in writing, but in person, the first they met - we'll never know.