My 2004 Toyota Sienna still has a cassette deck - good thing, too, since we use a cassette adapter to connect the iPod!!
Though I have been intending to investigate the possibility of adding a permanent wired in lead...
We recently threw out a whole lot of old cassettes - they'd all deteriorated to the point that there was nothing audible on them. They were mostly ones we'd recorded ourselves many eons ago to have music in the car other than the radio.