I can’t help but feel Classic Format will get very stale very fast - with such a limited card pool. When I complained about my entire Golden Classic Set being made useless in Standard - many players were quick to jump on me and tell me how the Classic Set was mostly full of bad cards that never saw play.
The nerfs that came in back in the day (e.g. to Leeroy) were to correct a meta that became largely unplayable and dominated by a few specific deck archetypes. How is bringing those back going to make that mode fun?
You watch - Blizzard will suddenly announce in a few months they are adding Naxxramas to the Classic Format to expand the card selection - as a way to try and milk cash from all of these new players they are trying to bring into the game now with the ‘free’ core set. I would bet money on it! They are trying to create a new generation of Hearthstone Players that they can sell all of their old adventures and content to.