Let's have a second trinket slot...

... just for and remove them from the shop. The new trinket holds only 1 charge, which is restored every X minutes. Being unable to buy wards at all, the fight for the vision control is much more relevant and the map is consistently darker. You also don't need to keep an empty item slot for a consumable throughout the entire game (which is a problem both in mid game, when you have many small components, and in late game, when you're full build and there's no more room for a pink). On top of that, champions with stealth mechanics aren't countered by an item that costs only 75 gold and can be bought whenever you want. They're still countered by true vision, but it's up to the enemy champions to use their wisely. For example, if I use it to ward a river bush in mid, I won't be able to see in her shroud, so either I have to wait for someone else to come and help me or I have to keep my true vision trinket for the time when I really need it.