Imagine paint by numbers. An unpainted picture has all of the detail/resolution just the color is missing. Adding color to it only changes the picture slightly.
This is similar to TV signals. Almost all of the picture information is included on the black and white portion of the signal and then the color is sort of painted on top of it afterwards.
That is why the improvement between svideo and interlaced component will be minor. You might be able to see it since your TV is big enough but I wouldn't fret.