Trainer cards - how future proof are they?

Anyone that plays pokemon TCG, how future proof are the trainer cards that are released so far?

I can see Sabrina, Misty, Leaf going far. What about the others? For example, will there be super potion that replaces Erika for all elements. Will there be a damage buff cards that replaces Gio and Blaine ?

I haven't played the physical cards, so what are your thoughts? Which ones make good investments?