When I was getting close to ordering in the spring of 2015, I went to a service/delivery center to look at the cars in person to help me choose a color. they must have had a recent delivery because the lot had quite a few new cars in various colors. But I happened to be there on a gray day with snow in the forecast -- a few flakes fell when I was there. In that light, all the dark colors looked the same! I could not distinguish a blue from a black from a brown or a green (Yes, the brown and green were still available then). The only car that stood out was a silver one. So I decided to order that color. But I was still deciding on options like air suspension and audio system and interior color, etc., so I took a couple more test drives. By the time I went to order in late July 2015, the silver was gone! I was disappointed, and I chose the multi-coat red (with gray leather upholstery). I have in fact been very happy with the red -- it still looks good after 7 years, despite my parking it outside. But every now and then I see a silver car and they still look nice! Especially with a sunroof -- the black offsets the silver nicely.
I do agree that there seem to be a lot of silver cars, but the Tesla silver is somehow a very nice, distinctive color.
If I were to order another Tesla and silver were available, I do not know what I would do -- the red has a sort of cachet that I like. But I agree that tesla should bring back silver and/or add more colors (in the interior, too).