Not just another one -- the Groupon clone to end all Groupon clones.

And I mean that literally. Once Google enters the game, who else will bother? Either

a) Google will lose against Groupon, proving that it's impossible to dislodge Groupon, or

b) Google will win against Groupon, in which case you'd be crazy to take on Google

David can sometimes beat Goliath, but if King Kong shows up to the fight as well then David should probably just go home.