Strength of The Ages unusable in Dominion
it never procs, its a dead mastery on the map 
it never procs, its a dead mastery on the map 
It's not a new thing that there's literally useless masteries. The -monster damage and +trinket range masteries from previous seasons come to mind. It is a little weird to have a useless Keystone though, since Riot's been pushing the "Keystones fundamentally modify how you play the game!" idea.
Maybe have Strength proc on super/melee minion kills? It'd still be highly situational (and mostly limited to bot laners), but wouldn't be outright unusable anymore.
Even if it did proc it'd be inferior to Grasp of the Undying. Might as well leave it be, it's not the only dead Dominion mastery anyway.
It seems like such a dumb thing for a Keystone to begin with.
Wouldn't shock me too much if it eventually gets axed and replaced with something less stilted.