The spectral transmission of a typical bayer filter is fairly wide, with the R G and B subpixels each capturing a large range of wave lengths. See http://blog.teledynedalsa.com/2012/11/ir-cut-filter-for-baye... for an example spectrum.

You could get some image with single wavelength red, green, and blue sensors, and it might be pretty interesting looking, but it wouldn't see much like our eyes do.