No new stadium, Santana is a pitcher.
It's not attendance, a new ballpark massively increases revenue streams due to marketing deals, advertisement opportunities, etc etc etc.
They could avoid that altogether by keeping both.
Well Pohlad Sr is dead, for one, also, i firmly believe they'd rather hang onto Morneau, not to mention that a package of Bucholz, Anderson and Kalish probably doesn't get it done, i simply can't find a deal where both parties can meet the middle ground. Morneau has a reasonable contract, but not a bargain, so the leverage they have is minimal, but their valuing of Morneau isn't, if you think about it, they're better off keeping Mauer and Morneau, and i (this is personal opinion) firmly believe they'll have the payroll flexibility to pull it off once the new stadium opens.