Cassette's are actually quite trendy now within the uber hipster music scene. It's so much cheaper to record on a cassette then make a 7" record. Obviously the sound quality is sub par and that's why the lo-fi indie hipsters love it. It's also retro to the younger generation who only know digital formats so it makes it cooler. Legendary indie rocker Thurston Moore, Sonic Youth, wrote the book Mix Tape: The Art of Cassette Culture.
Vinyl comeback now, cassette tapes next?