We still have Santander, and we'll always have some sort of lumbering meathead who needs the DH spot. It's nice to have the option to have the DH spot available for any lumbering meathead that we want to pick up.
Also, it's actually impossible to maximize the value of two two-way players by having them both DH more than they should. You are forcing both players to have less value by doing that. They might do it but I don't think they should.