It would be bad if we'll have to micromanage skills roster. I'd rather prefer it to be like in AD&D - you've learned a spell, it's in a spell book forever.
I mean, seriously, you can always glue more pages into spell book and suddenly forgetting how to ride a bike (swing a sword/shoot arrows etc.) is only realistic if you suffer from a sudden blow to the head and/or memory loss and even then body reflexes still remain.
If it were more like AD&D though, Memory stat would be merged with Intelligence. The higher your intelligence the more slots for spells (skills) you have. It's more logical and intuitive, I think.
So to me, if it won't do anything else than increase the slots capacity, this Memory stat looks pretty weak on its own.
