I main Lulu support and Dominion (800+ games), and removing one of her most iconic and useful abilities is just downright bad. If you want to remove her from midline that's fine. Lower her AP ratios, buff base damage to compensate a little, remove the ability to do a double Q with only one E, make her ult count as a heal so Ignite and such can reduce it, etc. Any combination of these, carefully put together, are way better than removing the ability to shield minions, which is essential in her kit since the beginning. I hope it's restored, or else it's just another knee jerk reaction to a problem that doesn't even exist in that regard of her kit.