There's nothing that beats a great transparency. Very hard to get them processed now, and even harder to get good Cibachrome prints. Although, I believe this place is still functioning: http://www.lab-ciba.com/index.html
I don't feel there will every be a better medium in photography, unless some sort of 3-d projection type photos gets invented in the future. They were so sharp, crisp, 3-d like without being 3-d, and there's something special about viewing a projected image on a large screen. A 6x7 slide can still rival any sharpness of a digital file created by the D800.
I fell like I always want to keep at least one 35mm film camera around, just to take some transparencies on occasion. I also like buying slide lots off ebay, either from amateur photographers stashes they've hidden away for years, or professional sets released for educational purposes back in the 60s-80s.
Damn, if there's one thing I miss in the digital age of photography, it's definitely slides.