Sighstone should be REMOVED
Because let's face it. No one would buy this item if you had the possibilities to have vision in other ways.
What trinkets showed us is that (with proper balance) you could basically play the vision games with just trinkets. If you imagine a game where the vision (and vision denial) is played only by trinkets you would find yourself not in need of buying this item anyore.
What is the problem with sighstone?: Riot said they want the vision to be played by all team members, and 1 players (the support or jungler) should not be forced into being a living ward-bot for all the game.
Think about it, right now it's the total opposite. Now more then ever supports are FORCED to buy this item because green wards no longer exist.
The vision game would be really played by everyone only if:
- the trinkets become the main and ONLY way to get vision (+ pink wards)
- sighstone get removed
another pink but doesn't see other wards and you can place as many as you want.