Vini is an excellent player. If he can maintain his fitness, he will become Real Madrid's main striker in the future. But Vini needs to be calmer and more modest. Vinny is a bit fierce. He reacted badly to the referee's decision. Such behavior should be avoided. He needs to be more calm. Also, Vini is often a victim of racism. I don't know why Vini gets attacked every time even though Real Madrid has a lot of black players. Vini may also have some personality issues. But Vini is still young, maybe that's why his nature is a bit fierce.
I am not sure that he will become the main striker as he is still a very typical wing player. Ronaldo was also a wing player but he was more directing his game towards the goal and the centre in many situations. Vinicius Junior isn't going straight into the centre as often as Ronaldo used to do it for Real Madrid. But Vinicius Junior doesn't even have to do it if Real Madrid now finds a strong replacement player for Benzema. He can then focus on his left wing position and pose a threat to their opponents from there.