Apple Discontinues iPod Nano and iPod Shuffle (macrumors.com)
From a report: Apple today removed the iPod nano and iPod shuffle from its website and online store around the world, suggesting the iconic portable media players may be discontinued. Apple continues to sell the iPod touch. Beyond new colors and storage capacities, Apple had last updated the iPod nano in October 2012 and the iPod shuffle in September 2010. Apple last updated the iPod touch in July 2015 with an 8-megapixel rear camera. Apple introduced the iPod shuffle in January 2005, followed by the iPod nano in September 2005. In total, there were seven generations of the iPod nano, and four generations of the iPod shuffle. The company has confirmed that it has discontinued the devices.
The iPod touch looks and acts like an iPhone, including standard and 3rd party apps, but without the cellular connection, phone or GPS. As much as I love the Pi, it is not a replacement for an iPod touch.
The iPod touch can also be important to iOS developers. A far less expensive device to test on. Also a convenient secondary or tertiary device to leave running past versions of iOS for testing.