If you have many USB ports, could you wire something up to run a television from multiple USB 5V ports or is there a voltage/amp issue of some kind in the way?
Depends on how much power the TV took. Theoretically you could do it, but it would be a huge waste.
Suppose you have a 300 watt plasma TV - that's 60 amps at 5 volts. That's the kind of wire electric dryers and ovens use. You could take that wire and divide it into many small ones, but you would still have that much wire which would not be practical.
However, an individual connector may be rated to 100 watts, but the controller may not be able to deliver 100 watts to each of the ports it is connected to. You might have to span the TV across several different hubs.
2. A 5V television? Not likely. This will lead to more types of sockets. Which is the opposite of what we want.
(* yes I know that the usb symbol should always face up, but that's often misused)