So I mainly play support, I am just a casual Silver player. These changes don't really make that much sense to me. I mean I understand that freeing up a bag slot is nice, but at the same time it is limiting early game vision in the bot lane severely. If you are unfortunate enough to get a lot of jungle pressure early and fall behind, there will be no way to play safe without just being fully pushed out of lane. It will take a very long time to get that 500 earned gold needed before you can start warding effectively. So before that happens you will be stuck with the yellow trinket, which means the enemy team will have uncontested vision until you complete the quest. Some people will assume that this should then fall on your team jungle to help secure your lane, but from what I know about jungle, you don't want to walk blindly into a losing lane without vision control, because the could lead to even more deaths due to counter ganks.
Then with the Spooky Ghosts gone, walking into the jungle to ward will probably lead to more deaths, unless it is the intent to make supports get blue trinkets, and leave the sweeping of wards up to the Jungler. 
Last season I was placed in Bronze 4 in Solo/Duo and Flex. I got myself to Silver 5 in both by mainly playing Support/Fill. I put a lot of emphasis on warding in every game, because I feel like information of location wins more games than general mechanics. This change now will leave a lot more unknowns on the map, thus making the support role even less important overall. I know before the support role was not chosen very often and was auto-filled, but now since support is worth even less, auto-fill support will happen even more often.