If the Live Nation one could be undone, and we could ban TM from operating venues and LN from selling tickets, and ban TM from having exclusive deals or sharing any of their "fees" with anyone else in any way, it'd be a start.
It will allow room for ticketing companies to actually exist though. Right now it's basically just livenation and a long tail of smaller companies, many of which got swallowed up by eg; eventbrite.
If they get split up, I predict we'll see everyone from AXS to Seatgeek to some Stanford blockchain bros with VC funding jumping into the market immediately.
They crushed all of the meaningful competition that long ago. Even breaking the company up into parts wouldn't suddenly fix the industry.