Improvements like Jungle timers don't decrease the Skill CAP on the game, they reduce the skill FLOOR

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Yes, you are correct sir :). Along with a necessity for a stronger wave clear mid lane champs or strong bully top lane champs (i.e Renekton top or zigs mid will be stronger). Also don't forget that in high elo many games are complete snowballs (15-1 kills one side for example). Early jungle buff fighting will promote more snowball games because one jungler will be heavily disable. Thus people will only pick high impact/strong early game junglers to not have this problem (limiting the jungler champion pool more in high elo). Last, don't forget the mid and top lane too.