I like the idea.
Problem is we need more than 10-20 scattered fans around the stadium chanting it for anyone to notice. Chances are no one will hear you because everyone's screaming from the hit and those close enough to hear you just wouldn't understand.
The original video would first need to be more popular. The local radio stations would need to talk about it and the newspapers would need to link to it so more fans could see it. If enough fans see the video (I'm talking thousands) and it's discussed in the paper and radio then it could catch on. People would be much more into it after seeing the video, that's why it's important to first promote the video.
Another possibility is that after a few games the Dolphins create a similar Gladiator highlight film with his Dolphins highlights and play it on the Jumbotron (along with the appropriate phrases on the loudspeakers from Gladiator) every time he makes a HUGE hit or sack. Then the Maximus chant would probably catch on quickly.