Partly - but people who like trying new restaurants are going to keep trying new ones. Not stop because they found somewhere they like. They might like the next place even more - and at half the price I'm sure they will.
I bet the average person would go back and/or recommend the restaurant to friends if they had a good experience though.
"The 32% that said they didn’t make a profit from the program reported that customers rarely bought more than the coupon deal and few returned to the business at a later date."
If over 68% of the customers returned, then I'd call that a huge success.