Bring back Green Stealth Wards with the same limitations as Pink Wards
TLDR: Reduced vision exacerbates the problem it was trying to solve(in otherwords counter-productive), by making players play extremely safe and boring rather than creating more action-gameplay.
With my proposal you could buy up to 2, and only have one active Green Ward at a time.
Its a nice middle ground considering we used to be able to buy and use 3 at once, then return to shop and buy 3 more for when the previous 3 expire.
I heard that rito reduced vision to force more accidental skirmishes or something like that, but all Ive seen is people(including myself) just siegeing mid lane most of the time or a 4-1 split, with even less desire to seek out brawls/picks/catches than before vision was reduced.
Im actually understating just how much more wimpy the game has become(early-mid) since the general vision nerfs.
Sometimes I play
purely for vision, and I hate this rodent...
Feelsbadman.
as my manasustain item on mages which then also allows me to grab 
for more wards