The plotters didn't really have much of an idea as to how they'd take power once Hitler was dead and they'd be facing an awful lot of Wehrmacht, SS and Party opposition, so I'd say they'd be more likely to fail than succeed.
With Hitler dead , Heinrich Himmler is really the only candidate to replace him. I expect he'll try to make peace with the Western Allies but there's no way in hell his offer would be accepted.
A Germany run by Himmler would be short lived but it would certainly be interesting, in the Chinese sense. Why? Because Himmler made his boss look like a pillar of sanity by comparison. Poison gas and human sacrifice are just two of the things you can expect from Himmler's Germany.
If the plotters somehow succeed, they'll have more of a chance of negotiating a peace but it won't be on the terms they want. Germany keeping it's conquests isn't happening full stop and neither is giving Germany a government that has the potential to end up as a second Weimar. Chances are , the new government eventually realises that they can't win the war and the peace they were isn't coming and so they opt for unconditional surrender to leave as much of Germany free from the Soviets as is possible.
Either way , the war ends a few months earlier than in OTL. Czechoslovakia and much of eastern Germany is spared from communism ( depending upon when the war ends ,even Hungary and Bulgaria might escape). This would seem to be a better scenario for a lot of people than OTL.
However there is one issue. In this scenario, Germany will have been brought down in part thanks to treason from within. As memories of the horrors of Nazism fade , might there arise a new "stab in the back " myth?