Pink ward and the Inventory

In this preseason, pink wards are the only wards you can buy in the store to give true vision and the trinket is the main source of invisiwards. Just my thought, but how are you going to buy pink wards when you have full itemization? Surely, someone would want to keep up with pink wards in late game even if he has a full inventory with his items. It's also good to mention that there are no trinkets that pop out a pink ward, like last season.

Sacrificing an item slot won't do. That'll do more hurt than good. I propose another inventory slot dedicated to that pink ward, since it's the only buyable ward at the time. Just my two cents.