Well if Baker is the Browns QB of the future, I do think they can win w/ him, its just at the right price. He seems like a mid-tier QB who could possibly break into the top 10 1-2 times over the next decade.
Say the browns offer him 4/80M or 5/100M w/ 50M guaranteed as an extension. Quietly mention if he doesn't take it they'll take steps to solidify the position after his contract expires. The offense is stacked, arguably the best supporting cast outside of KC, any QB would love to play for it and it could stay stacked if you don't break the bank on a QB. Baker improved a lot this year, but his teammates made him a lot better.
You have draft/FA that could possibly have Carr, Stafford, Ryan, Darnold, Jordan Love (maybe a No.2 to GB, Rodgers probably got a few years left, and he might be ready by '22), 1-2 1st round QBs falling to them (Lance), Meathead (maybe serviceable if you get him really really cheap, but prob not), Rivers? (if Indy drafts a guy) etc.
I think the Browns are in the rare position where they have some leverage on a QB. After all say he's a FA this year. If you offered Baker 4/80M this year and dared a team to match it, who would? Just because he might as good and/or slightly better as Kirk Cousins doesn't mean you have to pay him like Cousins.
