> problem is even if Ticketmaster is split up, a future administration will allow them to put themselves back together again

This is in the same category of technically correct but imaginary problem as if I take this medicine I will still eventually die. Or, if I repair my windshield it will one day break again.

If it’s a problem, and the solution is better than its cost, it’s worth solving. Even if that doesn’t solve it perfectly forever. I’d like to say perfect is the enemy of the good, but you’re defining perfection so unrealistically as to require disproving the heat death of the universe.