That sounds like a good take and it makes sense to help players improve their cards in game and get more rewards from playing. It will be strange not to get SPS from chests now/glints. I am curious what the SPS rewards for battles will be with the changes.
Two things though, does this mean summoners have now lost their ability? do you still need the upgraded summoner to use other cards abilities?
Some players targetted to stay in silver and gold and are now being forced to upgrade which could be out of their budget, I am not sure how they are feeling right now.
You still need the upgrade the summoners to play higher level cards.