Is Hakai a technique impossible for Goku to master? In the last chapter of the Dragon Ball Super manga,

 Beerus says that for using hakai he has to think only in destruction

Goku apparently tried to use hakai in the past, but it seems that he didnt master it since he says he failed using it.
Also, according to Dragon Ball, Goku can use the flying nimbus because he has a pure heart. Can a person like Goku with a pure heart do what Beerus says he has to do to use hakai?
Is Hakai a technique impossible for Goku to master?
No, for now. Hakai is a technique that can only be achieved by a god of destruction. If ur not a god it is impossible to master the hakai technique. But thats only looking from the anime. In the manga goku is able to learn hakai in a fight against fused zamasu. Sadly in the manga debut toriyama hasnt comfirmed for goku learning hakai to be canon.