I also worry about DS getting enough nutrition now that he has started being more picky about food. It is funny... now he will pick up a piece of food and stare at it, give it a lick, and either eat ot or toss it down with disgust! I worry that it will affect his health, but he is actually off the charts for height and at a very healthy weight for his age.
Try not to worry. I know it is easier said than done; trust me. But try not to worry! I think that it is good for him not to feel like your house is a restaurant. And you can always offer a healthy alternative, like fruit/veg (or a tofu hot dog, or cheese! These sound good to me!).