"This should be our last big set of balance changes; once we go live, we plan to make very few card changes, and only if they are absolutely necessary. "
It doesn't say they won't make changes to these changes. It says "live" too, which isn't for several months most likely, it's going to go "open beta" first and stay like that for a while most likely. I think the changes are ok, mostly, they change fairly stupid mechanics, granted I don't think these mechanics were necessarily overpowered and they could have been kept in the game, but it's their typical "protect the casual" response. OTK warrior was annoying to play against, now it's a lot more restricted and doesn't really OTK but you can still kill in 2 turns from 30 to 0 with the proper setup. Pyroblast nerf forces mages to play out a little bit longer which will force them to make some changes to their decks instead of "ignore everything, hope you draw enough damage and burn". You know like, counterspell/spellbender and polymorph, those spells that no one bother using because "lulz turn 8 gg". It's interesting for example that there's many control decks yet mage pretty much never plays as control, even though they have the best control spells in the game?
I don't know, maybe it's because they're not nerfing shit I'm playing so I don't mind the nerfs that much, but as far as I can see the nerfs aren't really bad for the game, as long at some point they stop nerfing and start adding new shit instead. Which won't happen until after live sadly, so that's way far from now.