One, baiting out a black shield implies it was used before a fight started and not in the middle of a fight. Not a solution.
Two, bursting it down with magic damage is a great idea! Except a lot of people's CC is built into their nukes, and if you use that nuke to break the shield the target in question still isn't CC'd. Also not a solution.
Three, Morgana is rarely out front; hourglass is a staple item. Flash exists. Her team will likely peel for her. Still not a solution.
Four, potentially viable scenario but also assumed that the target flying at your team won't ALSO just eliminate the people trying to eliminate them. Potential solution, but a bad one.
Five, "just ban it" is a garbage concept that Riot has sold each of you on for years. They get away with not actually balancing things because "hey, you have bans" when in reality bans were supposed to be a strategic way to give your picks an edge. You're gonna play something that relies on dashes? Get rid of champions that ground or cancel dashes. The development team should be held to a higher standard for such a popular game that prides itself in new ideas and mechanics. They need to stop being stubborn about whatever GROUNDBREAKING ideas they've come up with that continues to be impossible to truly balance, SCRAP it if need be and replace it with something better, or tweak it to a point where it works.
No champion should consistently be banned in most games, especially when you have so many champions to choose from. People shouldn't feel pressured into picking from a pool of 20 champions just because they're "better" than the other 120.
Thanks for coming to my TED talk.