Below in your post you suggest using vectored graphics. Now, if the artwork is rendered using vectored approach in the first place (e.g. Flash, 3D Studio Max, Maya, etc.), then using proper downsampling/multisampling will not make the graphics blurred. In fact, an antialiasing technique that is properly made should work with the image in such way that you will not perceive any visual artifacts or even realize that the image has been downsampled.
Putting cheap/crappy editing software (which may include popular software products such as Photoshop, by the way) as an example does not support your argument.
There is an entire area of sciences that deals with such issues, called Colorimetry. The proper downsampling needs to be made in perceptually uniform color spaces, including but not limited to CIELAB, CIELUV, DIN99, ATD95, CIECAM among many others.
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