Switching-abilities, moves and others who react to it. How could it change in the future?

[Matleo]

Switching user out:

-U-turn,
-Baton Pass,
-Volt-Switch,

Switching oponent out:

-Roar,
-Whirlwind,
Switching oponent out
-Dragontail,
-Circle Throw

Moves that react to switching:

- Perish song;
- Curse
- Ingrain
-Binding and trapping moves

Abilities that block switching:
- Shadow tag
- Arena Trap
- Magnet Pull

 

[Matleo]

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Do you think the ghost version of Curse should be buffed? - Pokemon Omega Ruby Message Board for 3DS - GameFAQs

Should Curse get a buff?

taking it half user hp by 50%, deals only 25% damage every turn to oponnent and stops working when oponent escapes battle through switching?

Z-curse is curse +heals the user fully up, but regular Curse still would need a change, especially if oponent switches out... not very Curse like investing 50% of hp, to only take 25% of oponents especiallyy if you are slow and can faint on the same turn.

Or could there be new move created that could cause Curse to become pernament with that pokemon even if it switches out?

Or could Curse be put like Spikes and after a second time could be put like a perish song till end of battle even if the opoent switches back to the battle. a 3 time it could work like on every of oponents pokemon but would need something to nerf like a terrain or moves to negate like defog and rapid spin but maybe magic and mystic moves could do that?

What do you think?
Or that Z-moves recharge is enough for lets say Deciduey to use Spirit Schackle and then Z-Curse to be a reliable thread?