I would argue emissions can be reduced by offering alternatives to SPS rewards as well. Why not have the option for rewards to be purely in glint, for those who just want to get more reward cards. Or DEC for those who would dump the SPS for DEC anyway because they want to buy cards or packs. Especially if you look at newer players, they want more cards and progression, not some token which is staked away for them and they can get access in 1-4 months and then they have to figure out how to sell, etc. It is cumbersome and "in your face crypto stuff", doesn't seem like a great NPE and I doubt that the development effort to reward another currency would be a major issue.
The DAO (meaning all of us) should at least entertain the idea that a circulation of SPS between players and the DAO is not the only way. I would even argue that a governance token should be held by the governing entities and not by the governed one, just because it needs it to reward.
Long story short, runway for rewards can be extended without allocating more SPS to reward pools by incentivizing other rewards.
Either way, a **game ** should reward gameplay, not simply holding a token.