Really good post! You are right the biggest opportunities to earn are not in the game itself at this point but blogging about it, liquidity pools, SPS staking and a few other non-game sources. I am not sure that soulbound cards will not provide earnings in the future, in fact I believe that the cards themselves will be worth something even after payment for un-lock. Also, like you mentioned stacking SPS and other Splinterlands assets is a good idea if your time horizon is between two to five years.