Why not just remove/replace Minion Dematerializer?
High elo streamers/ex-pros as well as pros themselves basically say it's necessary to take this rune because it helps you skew the laning phase by getting a good (sometimes better) back. Sure you can't use it on the 1st cannon wave anymore this patch but the rune exacerbates the "waveclear problem" instead of solving it. Doesn't this rune go against Riot's philosophy & goals of wanting more PvP action? Once you clear your wave (specifically as a mage), you don't need to stay in the lane, unless you really want to harass your opponent. Destroying the tankiest minion (besides supers) in one shot & increasing your dmg to all subsequent minions of that type reduces interaction with your lane opponent. Your opponent basically has to match you with this rune to compete.