To put it bluntly that sort of is how it is going to work.

This whole situation is actually a bit misleading and the team is terrible at optics. These are not true SPS requirements in the way that CP has league requirements. As of right now, you either have the CP to play in a league or you don't. This new system gets rid of that reality and will let you play in whatever league your rating will get you to. In exchange, your reward % will be lowered based on the SPS you have staked vs the SPS goal of that league but that doesn't mean the raw reward you actually earn is lower too. for example if the league has a 10k SPS target and you only have 7k SPS you'll get 70% of the baseline now but you'll still be able to play in that league.

To put it bluntly we will all likely end up with around the same amount of rewards. The reason why I think we all end up basically the same is that this hits all of us in the same way which means that all of us will no longer be hitting 100% of the baseline amount of reward per battle. This ultimately means that the baseline will go up to compensate for the fact the daily pool isn't being drained at the same rate.

The total amount of SPS in the daily pool isn't changing here so if the same number of people ultimately play in Diamond 1 after this change as before, those same people are going to be the ones ultimately splitting the Diamond 1 daily SPS pool and the % of base reward doesn't matter anyways.

On the flip side, if you currently play in a league that has an SPS target of 10k but have 15k staked, you are now earning 150% of the baseline. All of this will balance out. It is just hard to think about given it is in terms of % and people like to think about raw end rewards and think oh now I'm only going to make x% when in reality that won't be true.