Ink in Disney Lorcana is akin to mana or energy, as it is used to pay the cost of playing a card or activating certain abilities
When it comes to Magic finance, being able to articulate the answer to this question should bring our discussion full circle
Attack with a 2/3 haste, play two burns spells and deal 2 more damage
The fact Cyclonic Rift is asymmetrical puts you so far ahead
All this is to say, while people with big Reserved List collections will lose some value if the foil loophole is reinstated on the Gaea's Cradles and Gilded Drakes of the world, the impact is likely overblown, as the most expensive cards on the Reserved List are expensive because they are extremely rare and collectible, not because they haven't been reprinted
Whenever players use ink it is expended for that round, with all used ink being refreshed at the beginning of a players turn