Prediction: Groupon will eventually become old news, and irrelevant. A "Copy-Cat" will focus on developing a customer base consisting of quality niche customers, and become the dominate player.
prediction on top of prediction on top of prediction: Market forces and economics will come to play. (nature abhors a vacuum, where there's money people will flock).
Read somewhere that these guys use agriya groupon software, part of their ideas were copied by real groupon in their 2.0 release.
Also, coupons will still be boring.