It is a brilliant choice. I saw a professional production that did something similar during WHERE WILL YOU STAND WHEN THE FLOOD COMES? White robes lowered on a fly and the mob stood behind them. A chilling moment.
The original Broadway production did not do anything like that. The finale is staged much like the beginning-- the Confederate Memorial Day parade is being celebrated with Confederate flags waving but instead of Leo uncomfortably watching as the "outsider" as it was during the opening, it's Lucille watching-- horrified.
"I shall stay until the wind changes."