An American Triumvirate

Ok, so I just want to know if any of this sounds all that plausible.

First Henry A. Wallace remains VP into FDR's fourth term in office. There is an uproar among the Democrats about this, but FDR threatens to refuse the nomination and the Democrats end up going with it hoping nothing happens to FDR. Then when FDR dies many democrats especially in the south threaten to revolt. Henry Wallace then meets with Douglas MacArthur and Dwight D. Eisenhower and gets them to pledge their allegiance to him and to pledge that they will use the entire power of the US militaries to squash any possible revolutions. Peace in the states in upheld until Henry A. Wallace is assassinated along with many other prominent progressives in an organized attack on the party. Douglas MacArthur and Dwight D. Eisenhower then declare marshall law in the states and with the help of the new third man J. Edgar Hoover they manage to preserve union among the states. They publicly blamed the attack on communists in the states and begin anti-communist programs practically transforming the FBI into a secret police. The war in the Pacific ends in a similar fashion with atomic bombs being dropped and Japan capitulating. This 2nd Triumvirate holds power for a long time after pulling the US into a state of near-perpetual warfare against communism. Escalating the Korean war by nuking the China-North Korea border and potentially even sparking war sooner over conflicts like the Berlin-Blockade. In any war, the US wouldn't hesitate to use Nukes as MacArthur saw it as just a bigger bomb.
 
Why exactly are people thinking about revolting under Wallace? The usual factors that lead to a revolt are either disasters like a bad economy/losing a war, or people get fed up with the current system and see no other way to change it. Neither of those exist under Wallace. At the time of FDR's death the US was doing really well. Both fronts in WWII were going well, the economy was booming, etc. Also, people weren't fed up with the system. They were generally fans of what the government was doing, and believed that it was looking out for them. Even if everyone decided that Wallace was awful they don't need to revolt. There's a Congressional election literally the next year where voters can severely hamper the Wallace Administration's ability to get things done, and then in 1948 they can simply vote him out of office. This is also totally out of character for both Eisenhower and Wallace. Neither man had dictatorial ambitions, and Eisenhower was fairly moderate (which makes him leading a state which murders leftists, including the President, rather bizarre).
 
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