If Riot wants to keep buffing stealth champions can we get pink ward upgrades for trinkets back?

Or revert vision back to how it was in s5. Stealth champions have too much influence late game because no one is gonna be carrying around a pink wards once they hit full build. Who in their right mind is gonna sacrifice 2000-3000g worth of stats just for one or two pink wards? It doesn't make sense how if I need a pink ward to fight a Vayne or Rengar but I'll lose the fight anyways if I buy one because I'm missing out so much in raw stats.