Well, I don't think it was a problem. Staarcraft 2 was intended as an e-sports game from the beginning and it was fine. However when we ignore the inherent RNG in the games, SC2 stayed the same, but Gwent has developed a strong case of Hearthstonitis (especially when it was propagated as a "skill beats luck" game). It is as if in SC2 the devs added a chance to hit for all attacks and abilities.
nowadays Gwent has more viewers in twitch than SCII, Nuff said.