The problem with your wanting gladiator fights in America is that in Rome, after so many victories the gladiators were given their freedom. I don't want them roaming the streets.
Other than that, BRING IT ON!
Imagine the pay per view money that could be made or the ratings if they were broadcast on TV.
UFC was the closest thing we had to it, and it has been wussified a great deal and barely resembles its former glory.