Usb 3.0 port limits?

I heard the Physical Camera limit is equal to one for every USB 2.0 port it can have.

How many usb 2.0 ports does a single usb 3.0 equal?

Also should I assume that the quantity of one USB camera per USB 2.0 port assumes you use Full HD (720p60 or 1080p30) in all the image?

So if I play a 480p, 240p or 480i game, can I fit more cameras?

Also if the cameras start out at 640x480x30, then would more fit than if they were HD cameras?

Also would removing color information, which helps the anaglyph picture, also help my camera count?
 
My main question is I noticed my video was very choppy and would adding more USB bus bandwidth via Thunderbolt help with the chopiness of the cameras?

If so Thunderball 2 ports for Apple cost almost as much as upgrading to newer Apple.
 
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