I forgot to mention though that saccharin is still dead in the market because it has a really strong aftertaste.
No, it's back, it just only shows up in specific places. For example, you can get sugar-free tonic water made with it. In that case, the quinine completely covers up the taste of the saccharin. For the same reason, I predict that stevia will enjoy widespread use in root beer and ginger ale, but not in lemon-lime soda or in cola. In the former cases, you can barely taste the leafy aftertaste. In the latter, it's all you can taste — at least, these are my experiences, and they jibe with those of my lady.