Is it possible to merge sightstone's functionality with a yellow trinket?

As far as I'm concerned has a single advantage over , that being more warding potential. I mean I like the trinket better as it doesn't take up an item slot and it recharges without me basing. However the sightstone gives me 3 wards when I do base. The health bonus of a sightstone is a bit non-factor to me largely because that bonus isn't that much. The fact that it takes up a proper item spot for minimal stats doesn't exactly leave me thrilled. The fact that I can't upgrade it into something more useful also annoys me; RSS is a money dump when the game is going on 50-60 minutes and you can finally afford a full build.

Would it be possible (and even good for the game) to remove the sightstone completely and add a better upgradable warding functionality to the warding totem? For example 400 plus a yellow trinket gives me 3 3-minute wards that recharge 1 per 90 seconds or refills completely when I base, but not the health bonus. For another 400 the wards recharge at one per 60 seconds and I've got 4 or 5 charges.

I like the concept of the sightstone but I think when trinkets where created, it's warding functionality really should have been moved to that spot. I honestly don't think giving more people the ability to ward up is bad for the game. If I'm playing mid, I'd love for the ability to buy something so I can keep the river warded when I first back. If a non-devourer jungler could rush this would be awesome too.