I see everyone jumping on the 'we need access to more pinks!' bandwagon, but access to more Pink Wards doesn't address any of the underlying issues of stealth!
The Vision Ward and other instances of True Sight counter stealthed, no one is debating that, but it's terrible for the person playing stealth because there is virtually no counterplay to the instant speed True SIght AoE that the Vision Ward provides! And yes, I know stealth is frustrating to play against, but the answer isn't just 'more true sight'.
Why is stealth so oppressive? The answer, as far as I can tell, is that there is virtually no counterplay inherent to stealth. The tell-tale signs, audio cues, particle effects, and telegraphing on the stealth abilities in League are few and far in between. Wouldn't it behoove Riot to give clever and astute players a chance to spot roughly where a stealthed champion is? Wouldn't such clues instantly make stealth weaker? The Sweeping Lens is a great first step with it's silhouette effect - why doesn't Riot give us more options like this?
Another great example of what I'm talking about is Rek'Sai's Tremor Sense, as it grants info without providing targetability - a very real trade-off. If Riot introduced more detection effects, in addition to giving stealth inherent counterplay, wouldn't stealth be even weaker?
What about the nearsight mechanic? It is effectively psuedo-stealth (it provides untargetability) which is neat, but interestingly it isn't countered by True Sight. If Riot where to introduce more forms and variety of nearsight, then True Sight would be relatively weaker as there would be more than one type of 'sight based trickery' for players to contend with.
Likewise, if Riot gave us a greater variety of vision options, each unique and special in its own way, they could make the vision game much more dynamic, much more interactive.
And if stealth is made weaker by introducing more detection effects, more diverse vision options, and giving inherent counterplay to stealth, wouldn't that give Riot room to give the stealth crew the QoL buffs that they deserve?
Consider that none of the MOBAs or 'hero shooters' that have come out recently (Overwatch, DotA2, HotS, Paragon, VainGlory, Gigantic, Battleborn, Smite, HoN, etc.) really explore the possibilities of the vision game! League is poised to be the first! Riot, please!