Bad idea. This is a game where it takes money to compete. I feel that if you missed a few years, it was hard to get back into HS, but since blizzcon and the new “catchup packs”, new players can catch up to where most of us are.
All CCG’s are about buying and spending money on new collections. Nothing new here. Invest money into your collection. Drop about $50 into it and you will have a solid start to help with your grind if you dont want spend more after. F2p players shouldnt have the same access or fun as those who invest in the game. f2P should be a grind, always.
Why? To use your analogy, if the game went to being subscription based, 3 out of 5 of those players would just leave. Revenue for the company would decline.