Do you want him to score 25 goals when he's 40?
If Madrid overpaid for Bale than the sum for Pogba would go down as well. Perhaps not at the same rate, considering the British tax, but still.
Right now I'd say Hazard and Pogba would go for around the same price, Hazard would probably fetch more because he plays in a more valued position. While I would not sell Hazard for less than Messi plus cash, I'm not sure he'd go for more than Bale money. And right now he's the closest thing to Bale there is.
If Madrid overpaid for Bale than the sum for Pogba would go down as well. Perhaps not at the same rate, considering the British tax, but still.
Right now I'd say Hazard and Pogba would go for around the same price, Hazard would probably fetch more because he plays in a more valued position. While I would not sell Hazard for less than Messi plus cash, I'm not sure he'd go for more than Bale money. And right now he's the closest thing to Bale there is.