You're living in a fantasy word if you think it is possible for every class to have increasingly more and more equally competitively viable archetypes.
And keep in mind for a second that Blizzard is releasing hundreds of cards every year. That's like a new card every 1-2 days. You think Blizzard can keep that pace while also maintaining some kind of perfect balance of creativity and competitive viability without pushing any cards out of the meta?
There would obviously be variance in the viability, but I think we could be doing a lot better than what we have right now. Each Adventure leads to the creation of a few more archetypes, so I don't know why you think this is unrealistic when it happens already.
Yeah, Blizzard releases a lot of cards, but most of them suck as it is. That's up to Blizzard.
Absolutely some cards will get pushed out of the meta, and that is okay. For example, with that new Blood Clone card, Patron Warrior might stop playing something else. Or maybe that 1 damage worm would become standard in the deck. In an ideal world, there become multiple Patron variants that are viable, even. That is when the game really becomes expressive.
This feels a lot like old WoW arguments. Blizzard was incompetent, some people tried to pretend it was the best it could be, others were unhappy, and then Blizzard started listening and fixed problems instead of ignoring them.