This isn't brinksmanship.
No new deal is forthcoming, nor is there likely to be one.
You keep making the mistake of thinking that Sony needs Marvel Studios in order to keep making smart and profitable business decisions as it concerns the future of the Spider-Man IP and that it's therefore in their best interests to renew that partnership regardless of how long it takes to do so, which just isn't the case.
I think it is to be honest and I've not claimed Sony need Disney to make smart decisions.
Giving the SM franchise far more options post Venom and having all that external investment (not to mention the shared risk) is a smart move and one I suspect they'll seek out. The only question is how the power dynamic plays out at the time and a lot of that will rest on how profitable the next few respective films are. Sony won't just want to make a profit on Venom, that's a given, they'll want to make a comparable or greater profit than would reasonably be expected from an MCU collaboration, giving them the upper hand in negotiations.
And to reiterate @The Nth Doctor 's point, as a fan I'm not "clamouring" to see a SM/Venom cross. It's been done AFAIC and I'd rather see some new ideas in play.