They haven’t mentioned how many stars you will lose when removing them. 
※ Things are subject to change
They haven’t mentioned how many stars you will lose when removing them. 
※ Things are subject to change
Is this just fantasy?
Caught in a landslide,
No escape from reality.
I think they may be removing all existing cards when the change goes live.
Seemingly only main quest ones.
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There is an answer by the way:
And I already had a little debate about its meaning.
And it wasn’t implemented today. Yes, “future patch” != “next patch” 
I’m pretty sure they’re talking that the Monster cards rewarded by quests will no longer be done.
Ergo the Throne weaver monster card you get way back at level 30, will no longer be recieved.
It would be stupid to delete them since some users have already invested into them.
Hopefully they’re then planning to make all of these guys Field bosses.
Invested what? They could only invest cards from quests / dungeon bosses / field bosses.
Cards are officially untradable and what players are doing is:
This is not intended anyway.
why don’t they make quest boss cards different from field boss cards
say, quest boss cards has only 1/10 of the effect of the corresponding field boss cards
that would be nice to encourage people to do quest early on and speed up their process
Probably because some of those quest cards doesn’t have any field/dungeon boss equivalent?
So by that, it probably means that they only made the stat for the field/dungeon boss cards for now.
They invested cards into them, to level them.
Which you should know full well is quite time consuming to do on your own.
For instance in Itos I use temple shooters, but in Ktos my Sorcerer there has a Throneweaver Lvl 7,
It wouldn’t make sense for that card to simply disappear, and I doubt they’re planning to do so. Throne weaver was a popular card players used until they got their TS.
Now based on what was read, they plan it so that the two throne weaver bosses you meet in the early game will simply not give cards, as it’ll be removed from the quest rewards and likewise for all other quest boss cards.
Not that the existing cards will disappear from anyones inventory.
well, if they don’t have equivalent, then make those cards with no effects
i think it’s better than removing all of them, since some players love to collect cards even they are useless
of next year 
Time will tell
.
Well, they might use those non-existent card to test things.
Case in point, the two cards shown here? Gaigalas and Golem, neither have cards in iToS.
hope i can finnally find a use for my 10+ firelord cards ;/
So uhm… how well are the Swordsmen in kTOS doing with the recent buff?
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Still a ground placement effect tho.
Its a lot smoother in general.
Sometimes you escape CC you were late to pick up on because of the new resistances.
1.3x physical attack per strength is pretty good since it means 1 Str = 1.3 damage which then if you hit something weak to your damage type turns into 1.95 damage, then there’s other modifiers on skills which may take that higher, and there’s critical hits, and there’s attributes.
So to put it another way its small but there’s a lot of things that make it into a bigger effect.
But I really only log on my Cata to do number tests, otherwise I’m on my Sorc, Bokor or Hunter because I’m a masochist.