Since I posted my question back in November, I've learned a little more about contract law in PA as it relates to commercial real estate transactions. PA is a confession of judgement state, which gives landlords a major leg up in regaining legal possession of a space back from a tenant. Therefore, in PA there is no need for a landlord to work the quid pro quo angle (Tenant agrees to turnover the space and landlord agrees to not pursue legal action).
Also, regardless of the above, even if a good guy clause may seem "reasonable" I can't imagine many lenders would approve new leases with good guy clauses on properties they have loans on. Additionally, if a property is for sale, what investor is going to buy a property (a shopping center for example) if the tenants all have good guy clauses? Not many.