Raw Data,
I must say that i have to agree on your valid point regarding currency as well as types flown / conditions / expected formations, and procedures for displying aircraft with different weight classifications in the air simultaneously.
Currency on type, and ensuring the display is practiced, again and again and again in all formats at various airfields on NON display days, could go some way to ensuring incidents are rare, but the trouble is everyone is too busy driving other aircraft for their normal job, to keep current enough, except for a few drivers who fly nothing else apart from warbirds at Duxford etc.
This is my personal view.!