The difference between David Copperfield and David Blane, is that David actually can perform magic tricks. Anyone ever notice that every time they air those David Blane specials, we rarely see a single trick being performed? 95% of the time, it's reaction shots from onlookers, trying to give us the impression that something cool had happened, when, in reality, nothing happened at all.
Anyway... yes... David re-uses the same tricks over and over, I'm sure. But then... magicians have been doing the same tricks for hundreds of years now. If it's not a rabbit, it's a duck. If it's not a duck, it's a blue bird. If it's not a blue bird, it's an eagle. If it's not the cubs and balls, it's the shell and nuts. And if it's not the shell and nuts, it's the card and coins. Whether it's a space shuttle, an elephant, a car, or group of 13 people that vanish when the mirrors come out... it's all still the same thing, so why be surprised?
Remember in the mid 90s when Valentino, the masked magician, did those 4 Fox specials before his true identity was revealed? His defense was that he was trying to get magicians to think of new tricks, because they were using the same tricks passed on for eons. Sure... he pretty much killed Magic as far as Television specials go, and caused billions of dollars of loss to magic companies... but he was right in that it's all the same.
As for David being de-throned... I thought he already was when he stopped doing those CBS specials, and Lance Burton came out of nowhere and got all those TV and Vegas deals. I think he has an 11-year deal with the Monty Carlo that expires in 2009.
Now... for the biggest revelation in all of Magic...
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Not only are Sigfried and Roy NOT gay... they're actually good friends with Penn and Teller, who constantly make fun of them in their act. It's all a big trick.