I understand what you are saying. But look how many dead cards are in the current pool. A smart way would be to revamp those cards, thus creating new opportunities for deck building.
And they can add say 5 new cards per faction each quarter. I don't want to see 1000+ cards in this game in 2022.
I would also like terrible cards to be made playable (see Wild Boar and Savage Bear as examples for changes/reworks being done right), however those take forever to be made and usually expansions at the very least add something and if it were not for the complete misshandling of Dwarves ST alone would have even more diversity of archtypes (Elves, (Dwarves are unplayable garbage), Harmony, admittedly Shupe variants died (although Radeyah Elves should count as a second example) and I am propably missing some 1-card focuses piles like Shirru, which one could see as an archtype if one squeezes one's eyes enough).
The only new playable cards are almost always new cards and if it were not for the expansions we got Dwarves and Elves as archtypes, as well as harmony would not exist and I would rather lose against an archtype than against a pile of (mostly) unsynergetic cards that are just strong cards that require no actual focus on the deckbuilding (which SY has been, with a few exceptions (like Crimes)).
Wanna talk about stagnation, in W3WH there were 4 gwent factions. Then comes blood and wine and they add a 5th. It took them years to add a 6th. I have no idea if and when they plan to add a 7th, but we desperately need more than 6.
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There is no need for even more factions, it took them long enough to somewhat balance Syndicate and right now Syndicate has at the very least 2 playable archtypes (Whoreson Crimes and some incoherent pile of cookie cutter cards).
What we need are more archtypes within factions, Syndicate is the best example of what archtype indentities done wrong lead to, they have 1 actually playable archtype (Crimes), 1 deck consisting of cards one just throws on a pile that do not even necessarily have any synergies and every other attempt at an archtype (e.g. gangs) is so undersupported or straight up nerfed beyond being playable on the lower powerlevel when it was introduced (e.g. Witch Hunters) that the faction is just a sad image.
The only saving grace of Syndicate right now is Crimes (I am not even talking about powerlevel, the literal piles are just not interesting, they are everything that was wrong with HC when it started and which we (luckily) moved beyond).
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People already have those cards and the premiums to match. No one will buy powder or real money kegs for a revamp. Devs simply don’t care much about the quality of the game so long as it is good enough to bring in customers.
I honestly doubt that, if they wanted to bring in customers they would release more expansions, rather than reworking some things (they get nothing from, except people being
potentially being more satisfied) and introducing a couple of ornaments.