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The bandwidth was also selected to match the characteristics of the eye. We see the most detail in monochrome, followed by the orange-cyan I axis ( there were actually 2 color films made using only I axis colors), then followed by RGB... they gave the most bandwidth to what we see the most detail in.
Aside from the nicety of an IQ demod still displaying semi- passible color with one demod dead if they hadn't taken the detail perception of the eye into account we probably would have had a R-Y/B-Y transmission reception equal bandwidth system specified in the NTSC standard to simplify TX and RX circuits.
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