Solution to Summoner Specialist rune and Smite on Laners
I came up with a pretty easy solution to prevent laners from picking the Summoner's Specialist rune, starting with smite, getting a super efficient jungle item, and then switching to Heal, Teleport, or another summoner. Not sure if Riot came up with a solution but I think this one is pretty elegant—change Buying Smite won't grant access to Smite items to:
Smite cannot be swapped out while an item upgrading Smite is in your inventory or Upgraded Smite cannot be swapped out.
Now you have to sell the jungler item in order to lose smite. No one lanes with smite now, so I don't see a reason for it to change.