Honestly, Blue trinket WAS too good. Doesn't change the fact that Yellow was also way too weak, the glaring disparity was just greater with how weak yellow was.
Honestly, I wish Sightstone could be changed into a 0 stat item, that cost 500 gold. You could optionally put it into your trinket slot (losing out on recharging wards for stronger wards that don't recharge except on recall, or giving up other trinket effects), or upgrade it into various items that several classes can use, not just supports. Change it so that all players can only keep out 2 wards + Pink ( Remember, on base yellow trinket, even after buffs next patch, you only could have 2 wards out at all times anyway, with just one period if you let it fully recharge to max with a little overlap with a 3rd ward. This just means that the support has even less of a focus on keeping out 100% of the wards. Perhaps make RSS be able to upgrade the ward cap to 3 wards for people who are truly dedicated to warding heavily).
Now warding is pretty reasonable for all classes, but supports would have natural bonuses to their standard build path because of the ease of merging the support items with the gold gen ones, compared to weaker in efficiency class specific SS options. It would also open up Sightstone to not have health as a statistic, which isn't always a desired stat (not that it is bad, but I don't want to invest in it for a SS all the time). It isn't a bad stat, mind you, but I'd rather have AP or AD on some champs than health.