HTML on a prim vs. Texture at a URL

Kisa Naumova tweeted this earlier today:

If there was one thing I would like from SL, it would be to be able to use external images as textures, and not using the media URL. PLZ

Spot on... I couldn't agree more. This would be very neat and would, I think, be far more useful than the current direction in which "HTML on a prim" is taking us.