As much as Chuck & Wynona are a sweet team and I felt bad when they got U-turned they are on borrowed time already. I think the reason why they got U-tunred is because Meghan & Joey wanted to make sure they U-turned a team that was behind them. They had probably spent 30 minutes in a cab and had no idea they were in second place, if they knew what us viewers did they probably would have gone for a different team.
Also, is Dave & Connor the first team to actually give up on the race while essentially still having a chance? Other teams have quit in the past, but then they were already in last place and essentially just took a penalty that made them get eliminated, while Dave & Connor actually gave up, and would probably have survived the leg if they went on.
This makes Dave & Connor very likely candidates for a new Unfinished Business season.