That depends on how many input positions the TV has remaining.
The big screen LCD we purchased nearly a year ago has six external inputs and is no problem adding 'boxes'.
My sis-in-law had an older set with three inputs and already had a sat, box, dvd/vcr & kareoke machine. We ended up with an external audio & video switcher box that we fed the kareoke and wii systems into with the output of the switcher into one of the three on the TV. Works fine.