I don’t think Bambu would adjust the value of the points themselves. If anything, they’d adjust the rate at which one earns them. (as more or less already happened). I say this because with the boost system. Originally it was like 10 points per a boost, but they upped it to 11, and retroactively rewarded those extra points to anyone that already redeemed.
They haven’t done anything that would hurt or later adjust earnings/rewards in a way that would cause them to go down. They only adjust the earning rates. I think they’re aware enough to know the trouble it’d cause if they tried to adjust the actual value.