Seeing as it's all D&D at this stage, let's see if they can give the greatest show in TV history a proper send off. Important to note that they're unable to change anything based on fan backlash/reaction now, as the show wrapped up filming and production over a year ago already. So we're just going to have to live with whatever they've decided to scribble for the last 2 episodes of GoT EVER.
Let's see how far off the mark we can get, shall we?
The Golden Company, while having stationed a 20k-strong force in Westeros, have historically always fought for and been loyal to the Targaryens (they came from House Blackfyre, after all) - and yes, they HAVE broken contracts before.
The Iron Bank may have funded the deal, but Cersei has effectively already paid them back, and the IB's power has always been the fact that they "own" houses because of their debt, so have always been able to influence them. When the debt is all paid up, not so much.
The only thing on Euron's mind at the moment is how Tyrion knows Cersei is pregnant, when she's supposedly only just found out.
I think all this is going to culminate in Cersei getting done pretty soon.