My first mountain bike, Specialized Stumpy FSR, seatpost needed cutting to lower enough to unclip. I went out anyway, fell 4-5 times. I wasn't going to miss the opportunity to enjoy my brand new mountain bike. Imagine, first time on the trail, scared, balls to the walls, crossing creeks, etc., and you can't clip out. When climbing, if I stopped, I tipped over and bit the dirt. I was so mad, I could have climbed up a tree with that thing. I finally got so frustrated that I snapped the chain on a very steep uphill, I wasn't going down again.
On my road bike, I pulled up to a light post in a shopping center parking lot to talk with friends. I unclipped a foot to put on the concrete base so I could just sit, drink and talk. When I stopped and put my foot up on the base, my weight transferred to the side clipped in. I tipped over like a brick and bounced on the ground. Real cool move.
Clipless pedals have their limitations. The possibility of tipping over will allways be there. I see it as the rights of spring for someone in a group to drop. As the year goes on, everyone gets more comfortable and it happens less.