The limits on points going up or down only happen at the
DVC resorts - which the Disneyland Hotel is not one of them.
Point costs within a DVC resort can go up or down - but the total number of points in the resort cannot change. So if they raise the point cost of a particular category for a particular season by X points, then X points have to be lowered in another category (simplified).
Points costs at non-DVC destinations, like the Disney Collection (which is a limited set of non-DVC Disney resorts) are negotiated I believe every year, and could go up or down, but seem to be mostly up. They represent the equivalent number of points in room(s) that are turned over to the CRO office for cash reservations in order to make up the cost that DVC essentially paid cash for to get you your non-DVC room.
It should be made clear to all potential DVC buyers that using points at non-DVC resorts, while being an option, is not a cost-effective use of points. Yet we see a lot of people coming to the boards saying they only want to use points at the Poly, or the GF, etc. and then are upset at the cost.
Points costs at the DL resorts have actually seemed pretty low in comparison to the non-DVC resorts at WDW, probably because of the lack of a DVC resort at DL, but that is changing.
And I forgot about the fact that the Grand Californian will likely be removed from the Disney Collection once the DVC portion is complete. That could actually have two effects - raise the points cost at the other resorts (since there is now DVC accomodations locally), and reduce the number of rooms available at DL on points to DVC members overall.