General Idea for AP Itemization Update

So it seemed the main concern with AP itemization is that many the same items are used for every (AP) champion, regardless of role. I'm thinking the best way to divide the items between these classes is by range. I don't mean to make items melee or ranged only, but rather make them increase damage against close or distant enemies.

Basically, some items intended for short range (assassins, some burst mages, whatever) would get a unique passive (unnamed, so it could be shared between multiple items and stack) that increases magic damage by a percent to enemies with some small radius of them. Items for long-ranged mages could either just not have this passive, or could have a reverse effect, to deal more damage to enemies at a range than up close. This would also further reward enemies who can get on these mages.

Basically this would allow Riot to tune these items to only be strong on those champions they wish to use it on.