>>22431518Well lets see:
Ghost would essentially lose one of its biggest threats meaning the only thing that switches into it safely would be normal.
Psychic like said, wouldn't have to worry about something having immunity.
It'd nerf bug pretty bad, but not so much fighting and fairy since the latters can hit other major types effectively while bug would be stuck to grass and psychic, which at the same time if psychic is used more would make bug a little more useful.
Really its up to you to determine. Removing a type everyones used to entirely would definitely cause a huge shift in the game.