The reality, adding 10 people to the hearthstone team could increase revenue by simply adding cards to the game. Its been proven that hearthstone revenue was around 20 million a month and releasing content/cards has increased revenue, in some cases, by 100%.
https://www.google.com/search?q=hear...hrome&ie=UTF-8
I don't think we know enough about how a legacy server with a monthly sub would turn out to make the case that money could be made here and more of it. Adding team members to hearthstone, to increase the content provided is a direct return on investment vs a legacy servers which is up in the air.
But please, tell me more about "reality".