[SPOILERS] What Tyrion and Varys and seemingly everyone is missing

Edit: the thrust of my post is that Jon can’t take KL without Dany and if he does it with Dany then the thing Varys wants to prevent is unpreventable. There is no option where Varys can prevent bloodshed himself and also remove Cersei.

Everyone is apparently concerned with how to deal with Daenerys and how Jon is better suited to the throne and how Dany will be removed from the game. Why is nobody thinking “hey, it doesn’t matter what Jon’s claim is, he can’t win King’s Landing without Daenerys because he doesn’t have a dragon anymore.”?

Like, I know Varys is implying that they could assassinate Daenerys afterwards but Jon would definitely execute you for that, my merman. Jon isn’t going to go to war with Dany even if they try to make him, that’s not who he is.

You know what would be good for the realm, Varys? If you had a good idea in the past 15 episodes, that would be good for the realm.