That doesn't go well together
At least to Dortmund, the deadline seems to be important. What I know is how far Zorc has leaned out of the window. And I know Dortmund fans, I know the current sentiment among them, especially regarding the inner conflict of being labelled a selling club although they want to finally play with the big boys. This isn't comparable to the Dembele and Aubameyang situations in the past. The way Zorc and Watzke have positioned themselves, there is no going back. The whole club would go into meltdown if they sold Sancho at this stage. And they would've poured salt into the wounds of their own fans without any necessity. I doubt most of you guys did knew the names Zorc and Watzke before this transfer saga began, I've followed them very closely since Klopp's first seasons. If they communicate that strictly that a player stays, he's staying. As I said, this is in no way comparable with the Dembele situation - and Dortmund ended up with 145m € for him although he's not even half the player Sancho already is at a younger age. Only thing I can tell you, I can't see this happening at all and the overwhelming majority of German football fans agree.
My thoughts on the financial topic: Right now, top clubs seem to have a liquidity problem. They can finance their on going operations and wages but there's not much left besides that. This affects the spending capabilities and leads to a situation in which only clubs like Chelsea or City could realistically spend big. However, since top clubs aren't really losing money either, they can spend big on transfers rather quickly again once the incomes through ticketing etc. are back.
Dortmund for instance don't really seem to be under financial stress whatsoever. They even bought Bellingham and Can before they sold a single player. Those transfers would be on hold if they were struggling.
If anything, the Covid situation leads to less pressure to sell. Usually the fee decreases the fewer years are left on the contract (if that applies to the absolute star players is debatable, see Hazard for instance). However, if you can expect a huge raise in prices one or two years down the road, this reduces the urgency to sell as long as you don't have to fear losing the player on a free.