Yarp, but they should design a gun that is.
They have they are very inaccurate and to make them more accurate costs more money (more sensors required) meaning that they would become really expensive (due to needing more sensors).
They never sell light gun games in huge numbers because of the cost already associated with buying the gun, etc if you added even more cost on top it would make them sell even less, therefore they won't do it until it's cheap enough to do so.
Ideally you require 4 sensors one for each corner of the TV or maybe one for each side of the TV, if you could turn the camera into a sensor then you would only need an additional 3 sensors but the cost of the camera is a lot higher than a sensor but a lot of people could use the camera for other games.
If they also guaranteed that the sensors would be supported by future consoles and that other games would be compatible with them (made them universal) then I could see light gun games making a come back.
As it stands currently they are all poo compared to the old light guns which worked on CRT's.