My wife and I were on the early morning NW redeye from LAX-DTW departing at 12:30. The GA was offering a free roundtrip or a $300 voucher, but the next flight out wasn't until almost 9 am. I asked about being reaccomodated on CO or DL, but no go. Since my wife wasn't keen on missing Thanksgiving dinner with the folks in Ohio, we passed. It figures---the first time we're on an overbooked flight in well over a year and we couldn't volunteer.
I don't know if they got all of their volunteers, but I know FC was filled with op ups who boarded last minute. (One guy was very excited...he even asked the FA if he could request anything special!)
